Astrid Caldas

Climate scientist

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Astrid Caldas is a climate scientist with the Climate & Energy program at the Union of Concerned Scientists. Her research focuses on climate change adaptation with practical policy implications for ecosystems, the economy, and society. See Astrid's full bio.

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Photo: Alexander Gerst/Flickr

Hurricane Season 2019: Global Warming, Forecasts, and Probabilities

According to NASA, 2018 was the 4th warmest year in a continued warming trend since record keeping began in the 1880’s, with temperatures 1.5 degrees Fahrenheit (0.83 degrees Celsius) warmer than the 1951 to 1980 mean. And with it, a string of five consecutive years have been recorded as the five warmest on record. Is climate change having an effect on hurricane season, or on hurricanes themselves? Hurricane season starts on June 1st. Let’s take a look at the latest forecasts and science. Read more >

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North Carolina Army National Guardsmen and local emergency services assist with evacuation efforts in Fayetteville, N.C., Oct. 08, 2016. Heavy rains caused by Hurricane Matthew led to flooding as high as five feet in some areas.

What a Difference 0.5°C Makes! Or, How a Seemingly Small Amount of Global Warming can Lead to a lot More Rain

The soon-to-be released Intergovernmental Panel on Climate Change (IPCC) Special Report on Global Warming of 1.5°C (IPCC 1.5) assesses, among other things, the impacts that could be avoided if global warming is kept to 1.5°C instead of 2°C, and the ways we can limit some of the worst impacts of climate change and adapt to the ones that are unavoidable. Let us pause and think for a moment about this business of 1.5°C and 2°C, because 0.5°C just seems like such a small difference. Why so much discussion about this seemingly small difference in global temperature? Read more >

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Three hurricanes forming in the Atlantic in 2017. Photo: NASA Earth Observatory

Hurricane Season 2018 Begins: Will it be Different From Last Year’s?

Hurricane season starts Friday June 1st. I compare this year’s hurricane forecast to last year’s. Here’s how 2018 may be different. Read more >

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Dear EPA Staff, We Fixed Your Climate Change Talking Points for You

The Environmental Protection Agency (EPA) has sent a memo with “talking points” regarding climate change science and adaptation. They make some plainly inaccurate claims. So I made some edits in the interest of scientific clarity, and to make the guidance more useful for the states, cities, and tribes that the EPA is supposed to serve. Read more >

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The Moon is seen as is rises, Sunday, Dec. 3, 2017 in Washington. Photo by NASA. CC-BY-2.0 (Flickr)

Supermoons, King Tides, and Global Warming

Were you, like me, dazzled by the supermoon this weekend? Did you also stare in a state of wonder at the bright and shiny orb of color illuminating the night? Supermoons happen when a full or new moon is at its closest point to Earth. While we can’t see them during the new moon, supermoons that occur during a full moon are indeed something to behold. They bring thoughts of the universe, of space, stars and planets.

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