How do you deal with people that are nice and friendly...

It's not called "Global Warming" any more, I think you'll find. Because ecology scientists got their predictions so wrong in the late 20th Century they decided to rename the phenomenon as "Climate Change", which is imprecise. As with other "world problems" the issues have been overstated by those with vested interests - AIDS was never the threat to straight people it was made out to be, and how many aeroplanes dropped out of the sky on 1st January 2000 because of the "Millennium Bug"? The universe has been around longer than the arrogant scientists who claim to "know it all". I'm not denying that the planet is going through a period of climate change but it did that a long time before mankind made their appearance.