Kristy Dahl

Senior climate scientist

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Kristina Dahl is a climate scientist who designs, executes, and communicates scientific analyses that make climate change more tangible to the general public and policy makers. Her research focuses on the impacts of climate change--particularly sea level rise--on people and the places and institutions they care about. Dr. Dahl holds a Ph.D. in paleoclimate from the MIT/WHOI Joint Program in Cambridge and Woods Hole, Massachusetts.

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Kristy's Latest Posts

How Will People Cope With Extreme Heat and Rising COVID-19 Risks This Week?

As we speed toward a future where heat waves like this become the norm, we must do better. Read more >

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New COVID-19 Testing Data Reveal 70% More Positive Results in Non-White US Counties

New data compiled and analyzed by UCS shows that in counties with relatively large non-White populations, 70 percent more people test positive for COVID-19 than in predominantly White counties. Read more >

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Midwest flood victims/PickStock

Continued Social Distancing Critical for US Regions Where Flooding and COVID-19 Are Set to Collide

New county-level projections for the spread of COVID-19 make clear that reducing direct social contact with one another gives us the best chance of minimizing the chances for cripplingly high coronavirus infection cases in the coming weeks. In regions that could experience significant flooding this spring, strong social distancing measures could reduce the total number of COVID-19 cases by more than two-thirds, from more than 600,000 cases to roughly 170,000.

That means that continuing to reduce social contact with one another will also be the best way to limit the confluence of high COVID-19 infection rates and flood events. Read more >

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Pei and Shaman, 2020
Pei and Shaman, 2020
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New UCS Analysis: Coronavirus and Flooding Set to Collide in US

Last week, when the National Oceanic and Atmospheric Administration (NOAA) released its seasonal forecast for the spring flooding season, I was jolted into a reality that some people in the US are already experiencing: extreme weather stops for no virus.  Just days after NOAA’s forecast came out, the flooding arrived:  floodwaters  from heavy rains in central and southern Ohio required the evacuation of dozens of people, leading one local sheriff to state “God knows how we will figure it out with COVID-19.” Read more >

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Lessons from California in 2019: The Challenges of Adapting to Climate Change

There’s a perception in the US that California is a place of extremes, that it’s unique among US states—an outlier. Yet many of the state’s societal and climatic extremes, from widening income inequality to the precipitation whiplash we’ve experienced in recent years, are reflections of issues facing the nation as a whole rather than exceptions to the rule. Read more >

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