Here's his tweet from 2014:
“This very expensive GLOBAL WARMING bullshit has got to stop. Our planet is freezing, record low temps, and our GW scientists are stuck in ice.”
A few days later, he tweeted:
"NBC News just called it the great freeze - coldest weather in years. Is our country still spending money on the GLOBAL WARMING HOAX?"
In 2013 and 2014 he also tweeted:
"Snowing in Texas and Louisiana, record setting freezing temperatures throughout the country and beyond. Global warming is an expensive hoax!"
"Ice storm rolls from Texas to Tennessee - I'm in Los Angeles and it's freezing. Global warming is a total, and very expensive, hoax!"
In a 2015 interview, he said:
"I believe in clean air. Immaculate air.... But I don't believe in climate change."
In 2015, he said during a rally:
"Obama's talking about all of this with the global warming and...a lot of it's a hoax. It's a hoax. I mean, it's a money-making industry, OK? It's a hoax, a lot of it."
In 2016, he said:
"Well, I think the climate change is just a very, very expensive form of tax. A lot of people are making a lot of money. I know much about climate change. I'd be—received environmental awards. And I often joke that this is done for the benefit of China. Obviously, I joke. But this is done for the benefit of China, because China does not do anything to help climate change. They burn everything you could burn; they couldn't care less. They have very—you know, their standards are nothing. But they—in the meantime, they can undercut us on price. So it's very hard on our business."