Stage 1: There is no climate change.

Stage 2: The climate is changing, but humanity is not responsible.

Stage 3: Humans are responsible, but there’s nothing we can do about it.

Stage 4: There are things humans can do about climate change, but it can’t be done in our country.

Stage 5: Why the hell didn’t anyone do anything about climate change?

Update: Apparently there’s also a:
Stage 0: The Earth has no climate (!)

I mean… wow…