Donald Trump, Hillary Clinton, and Jill Stein have all answered 20 questions from the website sciencedebate.org about science.
Particularly interesting are their answers to this question (emphasis mine):
The Earth’s climate is changing and political discussion has become divided over both the science and the best response. What are your views on climate change, and how would your administration act on those views?
Hillary Clinton replied that “the science is crystal clear” when it comes to climate change. She went on to explain her plan to reduce US emissions 80% by 2050. (I explore this plan, and its potential costs, in greater detail here.)