I still use IRC. There are now modern web clients like The Lounge or Convos that can display/share images in the channels, keep history and push notifications. Apparently Convos can do video chat but I never tried it. Unfortunately I'm not aware of screen sharing features for any of these.
So on a very simple setup, you need an IRC server, then install and connect one of those clients to your server, and use them through a web browser, either on a computer or on a phone.
It's obviously not entirely Discord-like, but it is a simple way to chat and share images.
And all this because we refuse to slow capitalism down. The most important question on everyone's mind when there's elections is the economy and money. We need economic growth. Can't tax billionaires. Can't stop the consumption machine. Economic growth!
The sad thing is that most people are willing to relocate to avoid the effects it will have on them financially. It's not because it could help to mitigate the change; they won't move into a 15 minutes city. We'll just perpetuate the sprawl elsewhere and continue what we have always done before.
It's even more sad when I look at images of natural disasters, and beyond the immediate lost of lives, seeing people lose their things and run (drive) to buy even more things produced by the very system that is causing more frequent and intense natural disasters.
Beyond legislation and enforcement, it's been disappointing to try to explain those things to people around me for decades, hoping they will make the connection, only for them to end up being mad at high gas prices. Also, that survey asks about inside the US only. What if people from one state don't want immigrants from another state? It's gonna be interesting to see when the next inevitable question in a decade or so will be if people are willing to become climate refugees in other countries, and if citizens of other countries are willing to accept them.