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A French biochemist, Pierre Calleja, has devised a lamp that absorbs CO2 for its energy source, and which could clean up city streets while throwing a verdant light on them. A few are in use, but the unit is not yet ready for widespread installation. The “big screen” lamp shown in the video, 1.5 cubic meters (53 cubic feet) in volume, could absorb as much as a ton of carbon from the air every year – the same amount absorbed by 150 to 200 trees. The large tank is filled with algae, more often used to create biofuels, but used directly here to make light. Calleja envisions using such lamps on streets, or as shown, in underground parking garages, where …