It's more of a mix of anti-environmentalism (as environmentalism is closely associated in the public mind with the global warming denier's boogeymen -- liberals and the left), ignorance of climate science, anti-intellectualism, conspiracy theorizing that's rife on right-wing media, a desire to recklessly exploit natural resources, and a belief that counteracting global warming will harm businesses and cost taxpayer dollars, which they'd rather spend on the military or on handouts to corporations.