Or you could look at the news..?

Extensive flooding in multiple countries that didn't have such extremes before; sea level rising around smaller island nations (ok, maybe this one isn't so obvious yet but many nations are vocally concerned); wildfires across unprecedented range in time and area in multiple countries. In my own country (UK), we've had a noticeable shift over the past 10 years from four defined seasons to a smear of weather conditions across the traditional boundaries (particularly spring and autumn), significantly higher peak temperatures and the lows moving later through the year, shifted rain patterns (and worsening flooding).

News and anecdotal data are terrible sources. Point him to well-researched articles that do their best to show causation. But please don't just claim that extreme flooding must be caused by global warming without any evidence of causation when there are many variables in our world.

I did a data science project to show that the earth was warming (no cause implied) to counteract arguments that it wasn't. There is good research out there - use it.

You being in a position to affect change while expressing obliviousness of the blatantly obvious is frankly terrifying. Maybe, since you're missing something clearly witnessable by tge world at-large, you might help out by exposing what does not compute per your means of cognition.

I'll just sit tight.

Why not let someone else do your job since you're just sitting this one out?

Talk of "worsening climate crisis" is just fear porn made by people with an agenda

Only the derisive talk like yours has an apparent agenda, negating a valid conversation which has spent decades fighting against this form of apparently intentional ignorance. If you have something to contribute to the content, provide content - else, if you're against agendas, maybe practice not interjecting with yours in such conversations when the adults have them.

Or perhaps the "climate crisis" is bordering on pseudoscience. It's not even a falsifiable theory. Narrowly focusing on a "climate crisis" is doing demonstrable harm to our environment. Just look at how many actual environmental polluters are lining up to join the climate bandwagon. Actual polluters are using the cover of "climate crisis" to greenwash their pollution, not even mentioning the glaring hypocrisy of some polluters being allowed for purely political reasons.

So yeah feel free to keep trying to gatekeep legitimate conversations. Just don't pout when these conversations continue to be had whether you like them or not.

Good Shamylan twist you did there. So it turns out the issue is real and valid yet some people are engaging in the dialogue in bad faith. The solution to that issue is to eliminate the bad-faith dialogue, not to eliminate the dialogue. Baby, bathwater, etc.