What if that person think CO2 is good for life?

Nothing. You can’t logic someone out of a position they didn’t use logic to get to in the first place. There’s way more unmotivated and un-mobilized people out there that believe in human caused climate change that are more worth your time and energy.

If your house is too warm and you’re running 20 electric heaters but for some reason think it’s something else causing the heat, it’d still pay to turn off some of those heaters to compensate for the external cause since you actually have control over the heaters.

If you really think that anything you say will have any impact on them then maybe it doesn’t matter what the cause is as long as you can get them onboard with the solution. The two are inextricably linked so if they’re really adamant about this you’ll probably not be successful in this endeavour but it’s worth a try if you have some faith in them. If they think it’s all long term cyclical solar patterns or some other non anthropogenic cause it might be worth pointing out that it’s still happening and causing consequences. The trouble will be not implying too heavily as I have in my heaters example, that the solution is obviously linked to the cause, even if it is. Otherwise they will not believe you have common ground.

So… where’s the extra heat coming from? If you acknowledge it exists where’s it from?

Is it a problem? If it is shouldn’t we prevent or prepare for it?

Do research. Give them that. Walk away and never think or talk about it with them again.

You can’t fix stupid.

We have people like this running Egypt. They’re constantly cutting down trees!

Save your breath. It’s honestly not worth it.

Nothing. You benefit more from having someone who will help you plan and prepare for the effects of climate change than you do from having someone who agrees with you about the causes.

The reason for that is you and your comrade can’t do anything impactful about the human sources of climate change.

Just be like, “Okay, what about the pacific garbage patch? Did human activity cause that? Should we be trying to fix it?” It’s pretty hard to argue that the fish made all the used water bottles themselves.

Nothing. Just walk away. I don’t understand why people would willingly engage in completely pointless arguments at all… it’s a huge part of why I left Facebook and Reddit and come here now instead. People on there literally just to argue and pick fights with other people.

I don’t care if it’s my dad, my neighbour, or an old friend from school … if they believe that, they believe that, and nothing I can say is going to change their mind - and it’s not my place to change their mind.

If my son said that to me, yes, it is my place to make sure he is properly educated, so we’d go through some Wikipedia articles and/or watch a couple documentaries about it, so people who understand all of it a hell of a lot better than I do can explain it to him properly. I am not a climate scientist.

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I told my dad that even if climate change isn’t real, or if it is humans don’t contribute… what’s the harm in doing something about it? What’s the harm in doing something to help your grandkids have a world to grow up in and enjoy?

He installed solar panels a few years ago and now likes to talk about how he heats and cools his home without paying ConEd

This seems to have worked with my boomer mom: “be that as it may, wouldn’t we all be better off by reducing pollution?”

I tell them their brain is fried and I move on. Nothing will convince these people.

Slap them in the face. If they complain, tell them the pain is real but human activity didn’t contribute to it.