Why waste time on Climate Change?
Maybe to give the TV audience a potty break?
Lets assume climate change is a 50-50 proposition, as maybe the 97% of scientists who feel its critical to earth's health and future generations ability to live here, have an equal chance of being right or wrong.
If they're right, we should take it seriously
If they'te wrong, we've wasted a few minutes of the candidates time.
So even if only a small % of the electorate believe its important, given its possible massive importance, perhaps the two candidates who could shape or ignore answers or non-answers, to the problem, non-problem might devote some time to outlining where they come out on the subject and whether they believe we can weather the weather.
And Red if the subject bores you, which it may, you can take a potty break and jerk-off to Jeffrey Toobin's dick.