MONTRÉAL – With global warming, rainfall is increasingly falling in short, intense, concentrated bursts separated by longer dry periods, and these changes could have a potentially devastating effect on the planet. These are the conclusions of a new study co‑authored by Corey Lesk, at the Université du Québec à Montréal, and Justin S. Mankin, at Dartmouth College in New Hampshire. … They observed that regardless of the total amount of water received annually, this new rainfall regime alters how precipitation is absorbed by the soil and promotes greater aridity across the Earth’s surface. “Drought is often measured by what is lacking–the total amount of rainfall–but how precipitation falls is just as important,” explains Professor Corey Lesk. “This new type of rainfall regime leads to increased evaporation at the land surface, limiting the soil’s ability to retain moisture, and thus reducing the amount of water available on land for human populations and ecosystems.”