First, constantly blaming her parents for Greta speaking out for climate change is kinda stupid. Greta was concerned, and worried about something which she has full right to be worried about, and her parents allowed her to express herself, not say "No, you should be sitting at home, doing your homework". And the reason she got the fame she did was because she organised a student strike, something which shouldn't just be ignored.
And of course the climate has been changing since the Earth began, but that's no reason to carry on pumping more pollutants into the atmosphere. It's a fact climate changes, but we're pushing it down one road.
Also, Climate Change existing isn't a "Democrat" thing. What would you say to a Republican who says that we should take care of the environment? Would he/she/they be a traitor?
But, at the same time, I don't exactly agree with everything Climate Change-wise. It's not as drastically bad as it's claimed out to be. It has been very blown out. It's important, but we do focus on some of the wrong areas. And restricting every part of your life based on climate is kinda stupid.