MatsP wrote:Just about every large river in the world is a potential target. Part of the problem is that it's considered "green", which, particularly in tropical regions with greatly varying levels of water flow, it certainly isn't, because of the methane that is released when the dam fills up and vegetation on the side of the river is broken down, releasing methane and CO2. Methane is a much worse "greenhouse gas" than CO2, and there will be literally many tons every time the water level goes up in the dam. Because it is the tropics, plants grow very quickly on the side of the dam when the water level goes down...
Let's not forget the carbon sequestration ability of trees and thus the ability of the Amazon rainforest to offset CO2 emissions by absorbing it.