A) OP, I'm glad you're passionate about the home we all currently live on. But please conduct a thought experiment and replace some of the terms like "Climate Change" in some of your sentences with the religious deity of your choice. If you did that, you might notice that you're coming across as something of a zealot, and maybe aren't yet at the right stage of your development to be persuasive in these matters. Is putting yourself on a road to losing your friendship worth it to you?

B) As something of a "climate denier" myself (whatever the hell that label means), I'd say that the biggest problem with these discussions is people are often lumping a few different concepts into one general group and then begging you to accept that general label.

These concepts are the following:

1) Human activity impacts the Earth's temperature.

2) This impact on the Earth's temperature necessarily leads to catastrophic harm.

3) The only solution to this is measures like trying to limit human reproduction, increased government control of the economy, and only using certain fashionable energy sources like solar and wind while eschewing nuclear energy.

One can agree that concept 1 reflects reality, or concept 1 + 2 reflects reality, while having a completely different approach to concept 3.