In 2008, Zinke stated that he "support[s] increased coal production for electrical generation and believe[s] it can and should be done with adequate environmental safeguards," and that he "believe[s] the use of alternate energy sources and clean coal is preferred over petroleum based fuels."[31] In 2010, Zinke signed a letter calling global warming "a threat multiplier for instability in the most volatile regions of the world" and stating that "the clean energy and climate challenge is America's new space race." The letter spoke of "catastrophic" costs and "unprecedented economic consequences" that would result from failing to act on climate change and asked then-President Obama and then-Speaker of the House Nancy Pelosi to champion sweeping clean-energy and climate legislation.[32]