The problem with climate change is that there's never been a day in the history of the world in which the climate is not changing. I do not believe that human activity is causing these dramatic changes to our climate the way these scientists are portraying it. To say the science on this is decided is just really arrogant, to be honest with you. I'm not a huge believer in the global warming phenomenon. For me, we need to be transitioning from fossil fuels --I know it will take time -- to clean renewable energy. That's why I led with my two big proposals, namely I want to see us by the end of my first term have installed a half a billion more solar panels and by the end of my second term have enough clean power to run all the homes in America.