[CWuestefeld]

They were talking about contribution

The common jargon in Liberalese is "anthropogenic climate change", i.e., climate change created by humans. My argument is that they'd have an easier time getting people on board if they went about this without assigning blame.

Saying "there's a problem we need to solve" is going to get a more productive reception than saying "you created this problem and now we need to solve it".