Matt Simon for Grist

Environment

The fix for parched Western states: Recycled toilet water

The director of water re-use operations for startup Epic Cleantec holds up a sample of treated water.

Weather

Oh, great: Rat populations are surging as cities heat up

A rat looking for food in a New York City subway station platform.

News

The surprisingly simple way cities could save people from extreme heat

House with angled roofs that use white corrugated metal.