Being back in the US, I've once again been astounded at the number of people (many of them in important political leadership positions) that either don't believe in climate change, or deny that man is a cause of it. The stock position seems to be "I'm not a scientist" and then apparently not believing those who are scientists. The author of this article might just have a point - is someone who doesn't believe in man-made climate change despite overwhelming scientific consensus really fit for office?
To believe that human activity contributes to climate change, you need to believe two things. One, that certain gases trap higher levels of heat than other gases. Second, that burning fuel containing those heat-trapping gases releases them into the atmosphere.