A California billionaire is pledging to spend as much of his fortune as necessary to make climate change “the defining issue of our generation.”

Tom Steyer, who made his riches as a hedge fund manager, told The Hill on Tuesday that he wants to make climate change a campaign issue for years to come and Democratic support for environmental protections as widespread as support for gay marriage and immigration reform.

“The goal here is not to win. The goal here is to destroy these people. We want a smashing victory,” Steyer said of candidates he judges to be on the wrong side of the climate change debate.

“Really, what we’re trying to do is to make a point that people who make good decisions on this should be rewarded, and people should be aware that if they do the wrong thing, the American voters are watching and they will be punished.”