The California Heat Assessment Tool

As California’s climate warms, residents increasingly endure extreme heat events that adversely impact public health. This exacerbates existing risks and will bring new challenges for different regions in the state, threatening the efficacy of traditional intervention strategies. Current thresholds for heat alerts are based on temperatures that exceed historical statistical thresholds, rather than temperatures that cause public health impacts. These ‘health-neutral’ thresholds may underestimate the health risks for the most sensitive populations. The new California Heat Assessment Tool (CHAT) is based on research that establishes local, health-based thresholds for extreme heat that help public officials, health professionals and residents understand what changing conditions mean for them. CHAT is part of California’s Fourth Climate Change Assessment, a state-mandated research program to assess climate change impacts in California, and was developed by Four Twenty Seven, Argos Analytics, the Public Health Institute and Habitat 7 with technical support from the California Department of Public Health.

Explore CHAT at  This online tool advances the understanding of what types of heat waves pose public health risks and examines how the frequency and severity of local heat waves are expected to change over time due to climate change.

Read a brief report, The California Heat Assessment Tool: Planning for the Health Impacts of Extreme Heat, that shares key findings from the research and summarizes the data analysis visualized in the tool.

Access the technical report detailing technical methodology and view other projects funded by the California Fourth Climate Change Assessment.

Access the users needs assessment for a detailed explanation of the literature review and interview process that defines the data gap the research team addressed.

Download the full press release.

Key Takeaways

  • Current climate change projections show that a typical California summer in 2100 may be 4-5° F warmer than today. Heat waves are also lasting longer, occurring later into the summer season and in areas less accustomed to heat waves.
  • Elderly or very young people, outdoor workers and individuals with preexisting health conditions or limited resources are most sensitive to the impacts of extreme heat and may be disproportionately affected. Some of these sensitive, or frontline, populations may experience adverse health impacts at temperatures 6-8° F lower than the general population.
  • Current thresholds for heat alerts are based on temperatures that exceed certain statistical thresholds, rather than temperatures that cause public health impacts. These health-neutral thresholds may underestimate the health risks for the most sensitive populations.
  • The online California Heat Assessment Tool ( allows users to visualize projected changes in heat events that cause adverse health impacts, while also exploring data on social, health and environmental factors that contribute to heat vulnerability.

Public Health System Resilience Scorecard

Climate change will continue to adversely affect public health by threatening sanitation, altering the distribution of vector-borne disease, increasing the need for effective heat wave responses, introducing new mental health challenges and more. To help cities understand their vulnerability to these impacts and build resilience, the United Nations Office for Disaster Risk Reduction (UNISDR) developed a Public Health System Resilience Addendum for its Disaster Resilience Scorecard for cities.

The addendum includes 24 questions, defining a 0-5 scale for practitioners to quantify their responses (see example below). The questions cover the integration of public health with each of UNISDR’s Ten Essentials for Making Cities Resilient: disaster governance, disaster scenarios, finances, land use and building codes, ecosystem services, institutional capacity, societal capacity, infrastructure resilience, disaster response, and disaster recovery.

By capturing all of the possible weak spots in the broader health system, the addendum is meant to be a tool for mainstreaming public health considerations into disaster risk reduction plans, rather than just serving as a one-time assessment.  Using this integrated approach can help city officials build resilience over time. Recent events like the power outage that led to eight deaths in a Florida nursing home after Hurricane Irma demonstrate the preventable nature of many public health disasters. Ensuring that critical facilities have backup power supplies and that potential hazards are effectively communicated are ways in which effective planning can mitigate loss. By understanding existing vulnerabilities and how these will worsen with climate change, officials can implement essential adaptation measures that will save lives.

Four Twenty Seven contributed to this addendum and has developed a methodology to assess climate risk exposure in U.S. cities and counties. We are continuing research on quantifying local resilience to climate impacts and supporting public health responses to climate change. The forthcoming California Heat Assessment Tool will provide public health officials with an interactive platform to understand the projected increase in extreme heat events in each California census tract, based on the sensitivity of the local populations. It will also show the distribution of frontline individuals, such as the elderly, to inform effective local heat responses. This free, user-friendly tool will be live in mid-August.

Newsletter: Japan’s Floods Halt Manufacturing



Four Twenty Seven’s monthly newsletter highlights recent developments in climate adaptation and resilience. This month, don’t miss our analysis of Japan’s recent flooding, a new report on economic climate risk in Australia, and context around other recent extreme weather events.

In Focus: Time and Tides – Flooding in Japan

Four Twenty Seven Analysis

Japan was the inundated by over 70 inches of rain in early July, resulting in significant loss of life and business disruptions. The clouds have since receded, leaving economic damage with long-term implications yet to be understood. However, estimates expect industry losses to be in the billions USD. Destruction was centered in Okayama and Hiroshima, driven by flooding and landslides. Japan’s floods were followed by a deadly heat wave, threatening those left without power after the storm and hindering recovery efforts.

Our latest analysis identifies companies affected by the event based on the location of vulnerable corporate facilities. We find several automobile manufacturers and electronic companies closed facilities during the flooding due to supply chain and labor disruptions. Understanding the ownership and operations of facilities in the damaged areas provides insight into what companies and industries may exhibit downturns in performance over the near term and be vulnerable to similar storms in the future.

Read our Analysis

Responding to Economic Climate Risk in Australia

New Four Twenty Seven report explores calls for increased climate risk disclosure in Australia

Our recent report, Responding to Economic Climate Risk in Australia, explores the connection between climate hazards and financial risks in Australia, sharing examples of corporate adaptation and investor engagement to build resilience.

Regulatory pressure and financial damage are necessitating an increase in physical climate risk disclosure in Australia. The nation’s predominant sectors are also the most exposed to drought and heat stress.

In exercising their own due diligence and assessing the exposure to physical climate risks in their portfolios, investors arm themselves with valuable information on corporate risk exposure which they can leverage to engage with companies around resilience.

Read the Report

Climate Change Contributes to Record Heat

Record-breaking heat around the world

Many areas around the world recently experienced their highest daytime temperatures and warmest lows. These records include Burlington, VT which had it’s warmest recorded low temperature of 80 degrees on July 2. Montreal had its highest recorded temperature of 97.9 degrees on July 2 when around 34 people died. Shannon Ireland set its all-time record of 89.6 degrees on June 28 and Quriyat Oman experienced the world’s warmest recorded low of 109 degrees on June 28.

Climate change threatens public health

Extreme heat threatens human health and economic productivity through impacts on the workforce, power grid and vulnerable populations. The Washington Post explains the connection between climate change and heat waves, and the social and economic challenges they bring. Strong and hot domes of high pressure have become more extreme as the climate warms, bringing heat waves. “While warm summer nights may seem less concerning than scorching afternoons” warmer nighttime lows are dangerous because the body has no respite, the New York Times reports.

Further Reading

Inside the Office at Four Twenty Seven

Four Twenty Seven in the Media

Upcoming Events

Join the Four Twenty Seven team in the field at these upcoming events:

  • July 18: Summer in the City CRS Investing Summit, New York, NY: Macroeconomic Risk Senior Analyst, Lindsay Ross, will speak on a panel about assessing physical climate risk in investment portfolios at this annual convening of the responsible investment community.
  • July 19: Webinar: Introduction to the California Heat Assessment Tool, 1:30-2:30pm PT: Director of Analytics, Nik Steinberg, will introduce the California Heat Assessment Tool (CHAT) to California public health officials during the CalBRACE webex meeting.
  • August 28-29: 3rd California Adaptation Forum, Sacramento, CA: Join Yoon Kim, Nik Steinberg, Kendall Starkman, Josh Turner, and Natalie Ambrosio at this biennial convening of adaptation professionals. Yoon will moderate a panel on the legal aspects of adaptation finance, Kendall will facilitate a panel on mobilizing climate adaptation through partnerships and Nik will present the California Heat Assessment Tool.
  • September 11: Building Transformational Community and Economic Resilience: San Francisco, CA: Four Twenty Seven will host a side event alongside the Global Climate Action Summit on Sept 11 to discuss the role of investors, businesses and governments in building climate resilience, both in California and abroad. Invite only.
  • September 12-14: PRI in Person, San Francisco, CA: Visit the Four Twenty Seven booth and meet with our team at this annual gathering of responsible investment industry leaders.
  • September 12-14: Global Climate Action Summit, San Francisco, CA: Join the Four Twenty Seven team at this convening of global climate adaptation experts meant to propel action around the Paris Agreement.







Copyright © 2018 Four Twenty Seven, All rights reserved.
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Using Climate Data – 427 Technical Brief

April 25, 2018 – 427 TECHNICAL BRIEF. Financial institutions, corporations, and governments  increasingly strive to identify and respond to risks driven by physical climate impacts. Understanding the risks posed by climate change for facilities or infrastructure assets starts with conducting a risk assessment, which requires an understanding of the physical impacts of climate change. However, climate data in its raw form is difficult to integrate into enterprise risk management, financial risk modelling processes, and capital planning. This primer provides a brief introduction to climate models and data from a business or government perspective.

The first of several reports explaining the data and climate hazards analyzed in Four Twenty Seven’s equity risk scores and portfolio analytics, Using Climate Data unpacks the process through which raw climate data is transformed into usable metrics, such as future temperature projections, to help financial, corporate and government users productively incorporate climate-based analytics into their workflows. Beginning by explaining what a global climate model is, the report explains climate data’s format, computational choices to hedge uncertainty and resources for aggregated climate projections tailored to specific audiences.

Key  Takeaways

  • Climate models are simulations of the Earth’s future conditions. Climate projections are based on a compilation of many models and are publicly available.
  • Regional climate models and statistical downscaling improve the resolution of data produced by global climate models and are thus valuable options when projections are only needed for one location or several in the same region.
  • Climate models can be used to project future trends in temperature and precipitation, but can not project discrete storms or local flooding from sea level rise, which require additional data and analysis.
  • Different time horizons of climate projections have different strengths and limitations so it is important to select the data product best suited to a specific project’s goal.
  • There are several drivers of uncertainty in climate models and strategies to hedge this uncertainty can help users correctly interpret and use climate projections.

Download the Report.

Winter Storm Riley Threatens Pharmaceuticals and Airlines

March 2, 2018 – 427 ANALYSIS. As Winter Storm Riley threatens to flood the Boston area, we find pharmaceuticals and airlines industries are most exposed to flood risk.  Boston is a hub for both research and industry and the long-lasting financial consequences could be dramatic for some of the corporations with facilities in low-lying areas. 

Only two months after Winter Storm Grayson flooded Boston with its highest water level on record (4.88ft), Winter Storm Riley is now inundating the city and is predicted to bring water levels about 4.5ft above average high tide levels. The timing of Riley exacerbates this flood risk, as the storm surge is on top of already higher than average tides associated with the full moon.

Figure 1. Facilities in downtown Boston and Cambridge are particularly exposed to coastal flooding. Red represents the most exposed facilities while green shows the least exposed. Source: Four Twenty Seven

The greater Boston area is a hub for both research and industry and as this flooding is expected to worsen into the evening, the long-lasting financial consequences could be dramatic. Four Twenty Seven’s database of corporate facilities shows several industries and companies most exposed to coastal flooding. Our coastal flooding risk indicator measures exposure for low-lying facilities considering a combination of future sea level rise and storm surge from storms of varying intensity. A facility with high risk is likely to flood even during low intensity storms (e.g. 1 in 10 year events) and is also likely to experience a relatively large increase in storm surge.

Figure 2. Pharmaceutical facility exposure to coastal flooding in the greater Boston area. Red represents the most exposed facilities while green shows the least exposed. Source: Four Twenty Seven

Pharmaceutical companies are highly vulnerable to flooding in Boston, with medical research facilities and pharmaceutical preparation sites belonging to Eli Lilly and Pfizer showing the most risk. This industry exposure is particularly alarming given the thousands of lab animals (often kept in basements) and years’ worth of research that were lost by cancer and neuroscience research labs that were flooded during Hurricane Sandy. The recovery of these facilities required months and extensive funds, affecting this industry long after the storm.

Figure 3. Airline facility exposure to coastal flooding in the greater Boston area. Red represents the most exposed facilities while green shows the least exposed. Source: Four Twenty Seven

Airlines and other related airport services companies are also likely to be badly impacted by today’s storm. Storm damage of runways takes time and funds to repair, while impacting travelers and airlines in wide-reaching causal chains. While the location of Boston Logan International Airport makes it particularly vulnerable, the scheduling offices of airlines such as Delta and United are also largely exposed. Thus, in addition to costly delays and cancellations due to the local conditions, these airlines may experience more widespread scheduling difficulties if these buildings are inundated.

While understanding the long-term economic impacts of Winter Storm Riley will take many months, these findings highlight potential implications for the pharmaceutical and airline industries, their investors, and those who rely on their services.


Four Twenty Seven’s ever-growing database now includes close to one million corporate sites and covers over 1800 publicly-traded companies. We offer subscription products and advisory services to access this unique dataset. Options include data feeds, an interactive analytics platform and company scorecards, as well as custom portfolio analysis and benchmarking.

Lenders’ Guide for Considering Climate Risk in Infrastructure Investments

Climate change poses multifaceted physical risks for infrastructure investors, affecting revenue, maintenance costs, asset value and liability. According to the New Climate Economy report, global demand for new infrastructure investment could be  over US$90 trillion between 2015 and 2017. It is becoming increasingly clear that climate change must be considered in all infrastructure investment and construction.

Four Twenty Seven, in collaboration with our partners Acclimatise and Climate Finance Advisers, published a “Lenders’ Guide for Considering Climate Risk in Infrastructure Investments” to explain the ways in which physical climate risks might affect key financial aspects of prospective infrastructure investments.

Climate Change and Infrastructure

The guide begins with a discussion of climate risk, acknowledging that climate change can also open opportunities such as improving resource efficiency, building resilience and developing new products. It provides a framework for questioning how revenues, costs, and assets can be linked to potential project vulnerability arising from climate hazards.

Revenues: Climate change can cause operational disruptions that lead to a decrease in business activities and thus decreased revenue. For example, higher temperatures alter airplanes’ aerodynamic performance and lead to a need for longer runways. In the face of consistently higher temperatures, airlines may seek airports with longer runways, shifting revenue from those that cannot provide the necessary facilities.

Costs/Expenditures: Extreme weather events can cause service disruptions, but can also damage infrastructure, requiring additional unplanned repair costs. For example, storms often lead to downed power lines which disrupts services but also necessitates that companies spend time and money to return the power lines to operating conditions.

Assets: Physical climate impacts can decrease value of tangible assets by damaging infrastructure and potentially shortening its lifetime. Intangible assets can be negatively impacted by damages to brand image and reputation through repeated service disruptions.

Liabilities: Climate change is likely to pose increasing liability risk as disclosure and preparation requirements become more widespread. As infrastructure is damaged and regulations evolve, companies may face increased insurance premiums and costs associated with retrofitting infrastructure and ensuring compliance.

Capital and Financing: As expenditures increase in the face of extreme weather events, debt is also likely to increase. Likewise, as operations and revenues are impacted and asset values decrease, capital raising may become more difficult.

The guide also draws attention to the potential opportunities emerging from resilience-oriented investments in infrastructure. There are both physical and financial strategies that can be leveraged to manage climate-related risks, such as replacing copper cables with more resilient fiber-optic ones and creating larger debt service and maintenance reserves.

Climate Risks and Opportunities: Sub-Sector Snapshots

The guide includes ten illustrative “snapshots” describing climate change considerations in the example sub-industries of Gas and Oil Transport and Storage; Power Transmission and Distribution; Wind-Based Power Distribution; Telecommunications; Data Centers; Commercial Real Estate; Healthcare; and Sport and Entertainment. Each snapshot includes a description of the sub-sector, an estimation of its global potential market, examples of observed impacts on specific assets, and potential financial impacts from six climate-related hazards: temperature, sea-level rise, precipitation & flood, storms, drought and water stress.

Commercial real-estate, for example, refers to properties used only for business purposes and includes office spaces, restaurants, hotels, stores, gas stations and others. By 2030 this market is expected to exceed US $1 trillion per annum compared to $450 billion per annum in 2012. Climate impacts for this sub-sector include hazard-specific risks and also include the general risk factor of climate-driven migration which drives shifts in supply and demand in the real estate market.

As heat waves increase in frequency, people will likely seek refuge in cool public buildings, leading to increasing property values for those places such as shopping malls that provide air-conditioned spaces for community members. Increasing frequency and intensity of storms may damage commercial infrastructure, leading to recovery costs and increased insurance costs. Real estate managers may have to make additional investments in water treatment facilities to ensure the viability of their assets in regions faced with decreased water availability. An example of the financial impacts of climate change on this sub-sector can be seen in Houston after Hurricane Harvey. After the hurricane hit Texas in August 2017, approximately 27% of Houston commercial real estate was impacted by flooding and these 12,000 properties were worth about US$55 billion.

Download the Lenders’ Guide. 

For more guidance on investing for resilience, read the Planning and Investing for a Resilient California guidance document and the GARI Investor Guide to Physical Climate Risk and Resilience.

Newsletter: Climate Implications of Trump, Extreme Heat and the TCFD



TCFD to Release Final Report This Week

The FSB Task force on Climate-related Financial Disclosures (TCFD) will release its final report this week, on Thursday June 29. The report will be presented to the G20 in Italy on July 7-8. While it is uncertain whether the G20 will formally endorse the report given the Trump administration’s stance on climate change, the ripples from the report in transforming how financial markets view and think about climate risk are already being felt, and with or without further formal regulations, we expect investors will continue their call for greater transparency on climate risk and concrete strategies on decarbonization and adaptation. The public consultation conducted this spring showed the draft recommendations were generally well received by corporations and financial institutions alike. An average 75% of respondents found the recommendations useful, but non-financial corporations were unconvinced of the need for scenario planning whereas financial institutions were very supportive. Respondents were unanimous in calling for more detailed guidance and tools for the implementation of the recommendations, and the TCFD has now announced its work was extended through September 2018 to help support the implementation and dissemination of the recommendations.

More information on the TCFD, its recommendations and implications for corporations and investors:

Why BlackRock is Worried about Climate Change: Investors and Systemic Risk to the Financial System

The Health Costs of Extreme Heat

Record-setting temperatures and deadly heat waves have dominated the news these past weeks. Earlier this month came reports of a historic heat wave covering Asia, the Middle East, and Europe with Turbat, Pakistan experiencing record temperatures of 128.3°F (53.5°C), marking it as the hottest temperature ever recorded in May as well as one of Earth’s top-five temperatures on record for any month.

A study released last week found that 30% of Earth’s population is experiencing deadly heat for more than 20 days a year, and unless actions are taken to reduce emissions of greenhouse gases, climate change will result to close to 75% of the population exposed to deadly heat every year. Further proof comes from a new mapping tool released by Climate Impact Lab which takes data from NASA’s climate models to estimate how frequently a country will experience days of 95°F+ temperatures if emissions continue to rise through 2100. NOAA’s Climate Resilience Toolkit contains a wealth of information and tools on how to prepare for heat waves and health impacts of climate change in the U.S., including Four Twenty Seven’s Heat and Social Equity Tool, which combine projections from global climate models with socioeconomic indicators of heat vulnerability to compare the complex components of heat risk and resilience by county in the U.S. We also offer a tool to understand the impacts of extreme heat in India as part of the India Heat Impact Project.

The true risk of climate change is the inability to adapt to the changes it brings. Prepare for heat waves: by @427climaterisk

Trump and Paris: What Impacts on Climate?

The loss of the United States’ participation in the Paris Agreement is a blow to international climate efforts, though not fatal. In the wake of President Trump’s announcement to withdraw from the agreement, uncertainty has grown in the climate science and adaptation fields. Both domestically and internationally, leaders have reached out to form new coalitions for U.S. states, cities, and businesses to take the lead and continue pursuing what the nation had committed to as a whole. Read our analysis: Trump and Paris: What Impact on Climate?


(U.S. Air National Guard Photo by Master Sgt. Culeen Shaffer/Released)

Trump and Paris: What Impacts on Climate? via @427climaterisk

Audio Blog: Latest Innovations in ESG Investing

Investors are increasingly aware of options to invest responsibly, yet the myth persists that ESG investing sacrifices financial returns. At this year’s Sustainatopia conference held in San Francisco, Four Twenty Seven’s Director of Finance Colin Shaw joined a panel aiming to tackle the issue and present new ideas and tools for helping investors. Colin presented on measuring climate risk in financial portfolios, and the need for more climate data in order to better provide guidance to businesses for their risk management planning. Listen to the panel to learn new ways to steer investment towards sustainable solutions.

Meet the Team: Yvonne Burgess

Yvonne BurgessFour Twenty Seven is proud to welcome Yvonne Burgess to our team as Chief Systems Architect. Yvonne has extensive experience in information systems, project management, and software project management. As a Chief Systems Architect, Yvonne is leading the development of our data architecture, modeling and product road-map for a new generation of climate risk analytics products. Yvonne’s experience spans across startups, Fortune 500 corporations, and federal contracting work, blending deep technical expertise with strategic planning and thought leadership. Yvonne holds a Master of Science in Systems Management in organization development and information technology from the University of Southern California, as well as a Bachelor of Business Administration.

Upcoming Events

Join the Four Twenty Seven team in the field at these upcoming events:

  • July 26: GARI meeting, New York: Four Twenty Seven CEO Emilie Mazzacurati will join the Global Adaptation and Resilience Investment working group to discuss their forthcoming publication on climate risk in the financial sector.
  • August 24-25: California Climate Action Planning Conference, San Luis Obispo, CA: Climate Adaptation Senior Analyst, Kendall Starkman will discuss local and regional climate adaptation/mitigation planning.
  • September 18-24: Climate Week NYC 2017, New York, NY: Four Twenty Seven – details to be announced.
  • September 25-27: PRI in Person 2017, Berlin, Germany: Founder and CEO, Emilie Mazzacurati will present Four Twenty Seven’s work on financial climate risk and analytics to build resilient portfolios.

Four Twenty Seven Climate Solutions







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Our mailing address is:
Four Twenty Seven

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BerkeleyCA 94709

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Newsletter: The New Normal



News and analysis on climate change adaptation.

Four Twenty Seven Climate Solutions

Planning for Heat Waves: Heat and Social Equity in the United States

With an extreme snowstorm headed to the East Coast ready to wipe out early shoots and buds from February’s record-breaking heat, increasing variability in weather events is on the minds of many. To help with preparations for future heat events and understand the new normal, Four Twenty Seven has developed a tool to understand how heat vulnerability is increasing in the United States. This series of maps combine projections from global climate models with socioeconomic indicators of heat vulnerability to compare the complex and interconnected components of heat risk and resilience by county.

The maps feature a composite “Heat Vulnerability Score” indicator, created by Four Twenty Seven and peer-reviewed by CDC and NOAA, to identify vulnerable areas at the county level. This free tool can be used to discuss climate change impacts on public health with doctors, nurses and other professionals in the healthcare sector, to bolster to community engagement and long-term adaptation planning and is now featured on NOAA’s Climate Resilience Toolkit.

Mapping Climate Vulnerability in Denver

Extreme heat associated with changing climate conditions are expected to present challenges to human health through impacts such as heat stress. Working with Denver’s Department of Environmental Health, Four Twenty Seven developed a heat and Health Vulnerability Index and Story Map to illustrate the spatial patterns of vulnerability to extreme heat within the City of Denver. The interactive story map will help policymakers and community groups determine which areas and communities are most vulnerable and assess how the built environment, demographic factors, and elements of human health contribute to neighborhood-level vulnerabilities.

The Denver Department of Environmental Health will use the index and Story Map to evaluate neighborhood vulnerabilities, highlight how to reduce risks to vulnerable populations, and facilitate the integration of health and vulnerable populations into climate change priorities.

Protecting Against Risk to Climate Data Itself 

Starting with the White House website, the Trump administration is in the process of editing page content for multiple federal departments and agencies to remove references to climate change. This dismissive attitude towards climate change  most recently culminated by new EPA administrator Scott Pruitt’s false assertion that CO2 is not a ‘primary contributor’ to global warming in his first address to the agency. The same week, the EPA’s Office of Science and Technology Policy removed “science” from its mission statement.
Fearing for the datasets that support climate policy, a coalition of scientists and researchers has organized to rescue data from government websites. In February, analysts from Four Twenty Seven joined nearly 200 Bay Area open-data activists in a DataRefuge event at UC Berkeley. As a part of the larger nation-wide effort, the Berkeley event focused on NASA and DOE data, flagging over 8000 related webpages and backing-up many critical datasets.

Hottest. Year. Ever.

NOAA reported that in 2016, the record for the global average surface temperature was broken again. The global average of 58.69°F was the highest since recording began in 1880, or 1.69°F above the 20th century average. It was also the third year in a row that the record has been broken, and fifth year since the start of the century. So far, 2017 is seeing a continuation of the global warming trend with record-breaking heat in many part of the United States in February. (Image courtesy of Climate Central)

California Heat & Health Project

California's Fourth Climate Change AssessmentAs part of California’s Fourth Climate Change Assessment, Four Twenty Seven is developing a tool to inform planning efforts to mitigate the public health impacts of extreme heat across the state.

In the first phase of this project, Four Twenty Seven conducted an extensive user needs assessment, summarized in a report, California Heat & Health Project: A Decision Support Tool. The report shows the challenges and limitations of emergency response to extreme heat, and finds that the greatest strides can be made through interventions planned well ahead of time, such as changes in the urban design and social programs. The tool will be released in the fall 2017.

Read the report: California Heat & Health Project: A Decision Support Tool

Webinar: Incorporating Climate Adaptation in Local Plans

March 29th at 10am PST

Register Today

Don’t miss the upcoming webinar discussing the requirements and timeline for the implementation of California’s Senate Bill 379, which calls on cities and counties to incorporate adaptation and resilience strategies into local hazard mitigation plans and the safety element of general plans. Director of Advisory Services Yoon Kim will join the panel to share replicable strategies and good practices from Four Twenty Seven’s work with six cities in Alameda County.

Upcoming Events

Join the Four Twenty Seven team in the field at these upcoming events:

  • March 29Webinar: Incorporating Climate Adaptation in Local Plans co-hosted with ARCCA. See above for details.
  • April 6-7: 6th Stranded Assets Forum, Waddesdon Manor, UK: Meet with CEO Emilie Mazzacurati to discuss the use of asset data to measure financial climate risk.
  • April 20: The ProAdapt Symposium, Washington, DC: Emilie Mazzacurati will join the symposium from the Inter-American Development Bank, “Climate Risk and Investment: Framing Private Challenges and Opportunities”.
  • April 20: UC Philomathia Forum, Berkeley, CA: Director of Finance Colin Shaw will join a panel on how startups are using data science to advance environmental sustainability.
  • April 26-27: Ceres Conference, San Francisco, CA: Meet Emilie Mazzacurati to learn more about Four Twenty Seven’s services for investors.
  • May 7-10Sustainatopia, San Francisco, CA: Emilie Mazzacurati will present on how investors approach the physical risks of climate change.
  • May 9-11: National Adaptation Forum, St. Paul, MN: Yoon Kim will present on a panel on Innovations in Adaptation Finance, and Aleka Seville will facilitate a pre-conference workshop to discuss findings on climate adaptation investing.
  • May 17-18: Women and the Environment, Santa Barbara, CA: Aleka Seville will present on the role of entrepreneurs in climate adaptation.
  • May 25: Silicon Valley Energy & Sustainability Summit, Redwood Shores, CA: Join Emilie Mazzacurati to discuss corporate climate risk and resilience strategies.







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Four Twenty Seven

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BerkeleyCA 94709

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Audio Blog: Climate Data & Public Health, Mobilizing Adaptation Action

Director of Advisory Services Yoon Kim moderated a panel at the 2017 National Conference and Global Forum for Science, Policy, and the Environment. The session, titled “Climate Data and Public Health: Mobilizing Adaptation Action”, explored the role of interactive data tools in the adaptation continuum – from diagnosis to planning to solutions – through concrete case studies. Presenters brought local public health and private sector hospital perspectives from across the United States. You can listen to a full recording of the panel here, and follow along with the presentation slides.


  • Cyndy Comerford, Manager of Policy and Planning, San Francisco Department of Public Health
  • Michele Shimomura, Public Health Manager, Denver Department of Environmental Health
  • James Evans, Sustainability Analyst, Cleveland Clinic
  • Deborah Weinstock, Director of the National Clearinghouse for Worker Safety and Health Training, Michael D. Baker, Inc.
  • Jennifer de Mooy, Climate Adaptation Project Manager, Delaware Division of Energy and Climate

California Heat & Health Project

California's Fourth Climate Change Assessment

As part of California’s Fourth Climate Change Assessment, Four Twenty Seven is working with project partners to develop a tool that will inform long-term planning efforts to communicate the urgency of and mitigate the public health impacts of increasing extreme heat events across the state.

The Challenge of Heat Events in California

The number of extreme heat days in California are projected to increase from currently around ten a year to 25-50 by 2050, and upwards of 100 by the end of the century. Extreme heat has major impacts on human health, especially on the most vulnerable populations.

The California Heat & Health Project is funded by the California Energy Commission as part of the California Fourth Climate Change Assessment to develop an interactive, user-friendly tool that will provide public health and planning stakeholders with detailed projections on extreme heat events and the potential health impacts for local communities.

User Needs Report

California Heat & Health Project: A Decision Support ToolTo better inform this tool, we conducted a robust literature review and user needs assessment to understand how the California Heat and Health Project can best inform and improve current efforts in all California regions. Our report outlines our key findings from this research including results from an online survey and interviews with public health, planning and emergency preparedness stakeholders throughout California.

Our research shows the limitations of emergency response to prevent the health impacts of heat waves. The greatest strides can be made through interventions planned well ahead of time, such as changes in the urban design and social programs. Therefore, we conclude that a new online decision support tool is best geared towards informing mid and long-term interventions to reduce the public health impacts of extreme heat.

The online decision support tool is currently in development, and will be available in the fall of 2017 through Cal-Adapt, the state’s adaptation portal.

Download the report



Founded in 2012, Four Twenty Seven is an award-winning climate risk and resilience research and advisory firm that brings climate intelligence to economic and financial decision-makers. Four Twenty Seven helps investorsFortune 500 companies and government institutions understand how to quantify and monetize climate change impacts on operations as well as social factors that affect their value chain. Customers rely on Four Twenty Seven’s tools and models to factor into financial and operational planning processes. Four Twenty Seven’s team is comprised of highly qualified professionals with backgrounds in climate science, economics and finance, natural resources management, policy analysis, public health, and international development.