Warmer, Thirstier Air Worsens Drought

The document explains that rising global temperatures increase 'atmospheric thirst,' where the atmosphere absorbs more moisture from the land. In the western U.S., this heat-driven demand has replaced lack of precipitation as the leading cause of exceptional drought since 2000, contributing to a multi-decade megadrought in the Southwest and increasing wildfire risk in California and Nevada.

• Since 2000, atmospheric thirst caused by human-induced warming has become the primary driver of exceptional drought in the western U.S., shifting away from the historical primary cause, which was a lack of rain and snow.
• The atmosphere's capacity to hold moisture increases exponentially with temperature, expanding by approximately 4% for every 1°F of warming, which intensifies the water cycle by amplifying both heavy rainfall and drought.
• Human-caused climate change was responsible for 72% of the increase in atmospheric thirst in the western U.S. between 1980 and 2022, contributing to increased irrigation demand in California's Central Valley.
• Warming is slowing the recovery process from severe droughts in the western U.S.; current recovery times (2000-2040) are estimated to be one to four months longer than those between 1901 and 1980.
• Increased atmospheric thirst is elevating wildfire risk in the western U.S. by pulling water from plants; specifically, human-caused warming was the primary cause of the rise in vapor pressure deficit from 1979 to 2020.

APA

Fu, R., Williams, E., & McEvoy, D. (2025). Warmer, Thirstier Air Worsens Drought. Climate Central. https://www.climatecentral.org/climate-matters/warmer-thirstier-air-worsens-drought

Chicago

Fu, Rong, Emily Williams, and Daniel McEvoy. Warmer, Thirstier Air Worsens Drought. Climate Central, 2025. https://www.climatecentral.org/climate-matters/warmer-thirstier-air-worsens-drought.

Wikipedia

{{cite report |last1=Fu |first1=Rong |last2=Williams |first2=Emily |last3=McEvoy |first3=Daniel |title=Warmer, Thirstier Air Worsens Drought |publisher=Climate Central |date=1 October 2025 |url=https://www.climatecentral.org/climate-matters/warmer-thirstier-air-worsens-drought |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{fu2025warmer, author = {Fu, Rong and Williams, Emily and McEvoy, Daniel}, title = {{Warmer, Thirstier Air Worsens Drought}}, institution = {Climate Central}, year = {2025}, month = oct, url = {https://www.climatecentral.org/climate-matters/warmer-thirstier-air-worsens-drought}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }