California has been locked in a four-year drought that has depleted groundwater reserves, hastened the spread of wildfires, and caused severe crop loss. Reporting
in Science Advances
, researches say that by the end of the century, the Southwest and Central Plains regions are at risk of experiencing a megadrought—a drought that lasts for multiple decades. Climatologist Jason Smerdon discusses how climate change might be pushing us towards a drier future.