"37% of voters believe global warming is a hoax, 51% do not."

According to a PPP poll, which also found:

28% of voters believe secretive power elite with a globalist agenda is conspiring to eventually rule the world through an authoritarian world government, or New World Order....

Voters are split 44%-45% on whether Bush intentionally misled about weapons of mass destruction in Iraq....

15% of voters say the government or the media adds mind-controlling technology to TV broadcast signals....

11% of voters believe the US government allowed 9/11 to happen....

So take that into account as you assess the significance of 37% of voters believing global warming is a hoax. On the other hand, the question uses the word "hoax," and that would require a "no" answer from people who disbelieve in global warming, but don't think anyone is deliberately tricking us. That is, if you think that existing science isn't good enough to predict what will happen to climate in the future or if you think the science is skewed by policy preferences or the politics of grant money, the word "hoax" doesn't express what you think. And obviously the whole poll is nudging you with the overarching question: Hey, are you some kind of conspiracy kook? If you understand questions by the company they keep, you get the idea that the answer to everything is "no."