German nuclear power plant decomissioning could sink the Kyoto global warming protocol if pushed at too fast a speed, climate experts said at a conference in London on Tuesday. Last week the German government set a 2020 deadline for a pull-out from using nuclear plants for electricity generation but Germany's Green party wants a faster phase out."You could not phase out German nuclear power in 10 years and get Kyoto. It would sink the protocol," said Michael Grubb, professor of climate change and energy policy at Imperial College, London.