Donald Trump believes climate change is a hoax. He has shown no ability to critically think about complex issues. Therefore, he likely believes what his conservative advisers are telling him. Overall, the Republican Party does not believe climate change is real. He has not listened to scientists, so he has no basis for changing his mind.
Donald Trump, like many Republicans, does believe that climate change is a hoax. Trump is a strong supporter of the American energy industry, because of the good paying jobs that it creates for workers. Trump wants to expand domestic energy production: oil and gas, coal, and all of the above. Since Trump is such a supporter of oil, gas and coal exploration, it is unlikely that he really believes in climate change.
No, Trump does not believe that climate change is a hoax. No educated person believes that climate change is a hoax. There is ample proof that climate change exists and is occurring. Donald Trump is a smart man even if some of his beliefs about people are offensive and stupid.
No, I don't believe that Trump actually thinks climate change is a hoax. He may think that the threat is overexaggerated or he may believe that the human race's role in climate change is negligible. However, I think he just misspoke when saying that it is a complete hoax. He needs to learn how to phrase things better.