Um, other plants? Ok, but in all seriousness, carbon sequestration. There are some ideas for how we can capture carbon dioxide, liquefy it (because in the liquid state it takes up less room) and inject it deep into the earths crust. However, as this article on treehugger.com notes, it is not a very practical solution for stopping global warming, due in large part to the incredible volumes of carbon that would need to be sequestered and the possible dangers of leaks.
Algae in particular sequesters a substantial amount of carbon. Algae farms would be an incredible way to reduce carbon while producing energy. Aside from plants, technology is currently in development to capture carbon from power plant gases post, pre and oxy-combustion.
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