These “biosolar panels” suck CO2 from the air to grow edible algae.

At Imperial College London’s new campus in West London, some rooftops will soon hold bright green “biosolar” panels covered with algae. The plants suck carbon dioxide out of the air and produce fresh oxygen at a rate 100 times faster than trees covering the same amount of land–and then the microscopic organisms can be harvested to be used in food.

By Adele Peters