CO2 Powered lamps

French biochemist Pierre Calleja has invented an innovative algae lamp, and it's claimed to absorb 200-times more CO2 than trees, at the rate of 1-ton annually, or what a tree absorbs over its entire lifetime.

Pierre has basically developed a lighting system that requires no electricity for power. Instead, it draws carbon dioxide from the atmosphere and uses it to produce light as well as oxygen as a byproduct. The key ingredient? Algae. There are certain types of algae that can feed off of organic carbon as well as sunlight, and in the process produce carbohydrate energy for themselves as well as oxygen as a waste product.
source: geek