French biochemist and Shamengo pioneer Pierre Calleja has invented this impressive streetlight that is powered by algae which absorbs CO2 from the air. We have featured algae-powered lamps before but this one takes out 1 ton (!) of CO2 per year. This is as much CO2 as as a tree absorbs on average during its entire life.

While development is still needed to make a cost-effective product, the microalgae streetlamp has the potential to provide significantly cleaner air in urban areas and revolutionize the cityscape.

Source: TreeHugger