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Thomas 'Tom' Steyer, founder of Farallon Capital Management LLC, speaks during a Bloomberg Television interview in Pescadero, California, U.S., on Wednesday, Dec. 4, 2013. Keystone XL will be a 'major driver' of oil sands expansion that significantly raises the risks of climate change, said Steyer, a former hedge fund manager who has spent some of his fortune fighting the pipeline. Photographer: David Paul Morris/Bloomberg via Getty Images

Thomas 'Tom' Steyer, founder of Farallon Capital Management LLC, speaks during a Bloomberg Television interview in Pescadero, California, U.S., on Wednesday, Dec. 4, 2013. Keystone XL will be a 'major driver' of oil sands expansion that significantly raises the risks of climate change, said Steyer, a former hedge fund manager who has spent some of his fortune fighting the pipeline. Photographer: David Paul Morris/Bloomberg via Getty Images