“Shamengo pioneer Pierre Calleja has invented something truly remarkable – an algae lamp that absorbs CO2 in the air–at the rate of 1 ton PER YEAR, or what a tree absorbs over its entire lifetime!  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.”  See this Youtube video.