Enlarge (credit: Roman Studio/Getty Images) Our atmosphere holds six times more water than you’ll find in all the rivers on Earth. The dew drops you see on grass and water droplets on a cold juice bottle are evidence of this natural reservoir of water. Despite its ubiquity, 2 billion people on Earth still don’t have access to clean drinking water. A technique called atmospheric water harvesting (AWH) can allow us to extract some of this freshwater out of the air.