There's no mention of how the figure for Biofuel is arrived at so I'm not sure that I can agree with it (the idea that arable land is spent on biofuel, thus driving up food prices was doing the round a while ago). With that possible exception, my opinion is that all four are pretty dangerous. It seems they are all at least twice as dangerous as Natural gas. I disagree that it looks really safe compared to the others. I agree that it is grotesque to use current events to support related agendas.