Global warming is worsening droughts, making sea levels rise, and fueling deadly storms. Now scientists have a new problem to add to that list: Climate change is helping rat populations thrive in U.S.

Rising seas, intensifying droughts, worsening floods — these are well-known effects of climate change, the consequences of pumping too much heat-trapping pollution into the air. Now, we may be able to add another unexpected outcome of human-induced warming to that list: Rats.