FuelCell Energy Inc (FCEL)

[krays]

3) Algae Consume CO2
Like any other plant, algae, when grown using sunlight, consume (or absorb) carbon dioxide (CO2) as they grow, releasing oxygen (O2) for the rest of us to breathe. For high productivity, algae require more CO2, which can be supplied by emissions sources such as power plants, ethanol facilities, and other sources.

http://allaboutalgae.com/benefits/

Exxon has big plans for both!!

https://corporate.exxonmobil.com/en/research-and-technology/advanced-biofuels/advanced-biofuels-and-algae-research