On the debate stage in Milwaukee last week, the eight Republican candidates in attendance got a surprising question from the moderators: Do you believe in human-caused climate change? Only Vivek Ramaswamy, the 38-year-old former pharmaceutical executive who has seen a surprising spike in polling over the summer, seemed to have a sound bite ready. “The climate change agenda is a hoax,” he said. “The reality is more people are dying of bad climate change policies than they are of actual climate ch