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Greenpeace does not understand that there is no such thing as renewable energy. Physics has theories. Thermodynamics has laws and the 2nd law of thermodynamics basically says "entropy always increases".

The contraption* I mentioned upthread can theoretically be built using only stone and wood tools, some trees, beeswax, animal fat, organic rope, a clay pot, and some fires to melt the wax and and animal fat. There isn't much of any complex "green" machinery which doesn't doesn't require setting...

The 20terajoule number for 1kg of uranium works out to ... 20x10^12 Ws or 5,555.5... MWh. That's a steady 634.2kW from a powerplant which goes through 1kg of uranium per year. Little Boy had 64kg of uranium in it. Nuclear powerplants tend to be big. The two A1B's in the latest American CVNs...