> Hydo is very cool, and very green. Well, maybe. I think this depends on what you mean by "green". If you mean low on CO2 emissions, then sure, but we need to

> Hydo is very cool, and very green. Well, maybe. I think this depends on what you mean by "green". If you mean low on CO2 emissions, then sure, but we need to consider habitat loss, methane emissions from decomposition, and the possibility of triggering earthquakes. Hydro is also quite expensive to build, and often requires seizing land through processes like Eminent Domain (in the US).