Independent (UK): The Deepwater Horizon oil spill is making Americans think more about a clean energy future — but not yet to the extent of having to pay for it, or to tackle climate change, one of the leading US thinkers on global warming policy said yesterday. US citizens are “horrified” by the pollution in the Gulf of Mexico, and are starting to think more about cleaner energy sources such as wind and wave power, said Eileen Clausen, president of America’s foremost climate think-tank, the …