How long do you think humans have before we go extinct?

Fair warning, this post is pretty pessimistic.

So there was a post a few days ago about global warming and the deaths it caused from the heat wave that scientists confirmed was a result of global warming.

I wanted to get an idea of how many people are aware of some of the estimates scientists have made regarding the likelihood of humans going extinct somewhat soon.

I have seen figures that show that as soon as 60 years from now humans could be part a mass extinction both from global warming and temperature issues, as well as from issues with our soil, pollination, and food production.

Essentially many scientists now believe that we are either going to burn to death, overheat to death, or starve to death in the somewhat near future.

I really believe that it's coming soon, with everything going on in our world.

My estimate would be anywhere from 60 years to 100 years from now.

Now comes the part that I would really like someone to answer...

Why is nothing being done about it? I can't wrap my head around it. It seems like no one cares and even those who do just want to find tiny bandaid solutions that really aren't going to make a difference.

Do humans actually care so much about money and things that we're willing to die for them? I literally think about our grandchildren or great grandchildren starving or burning to death with how things are going, and I would be willing to give up everything to change this. Like I would legitimately throw this phone in the garbage, give up electricity, all consumer goods, and everything destroying the environment and would be happy to do it if I knew that the whole world was doing the same (because it will only work if it is a huge amount of the population). I already try my best to do what I can like many others for example buying used, recycling, using reusable over disposable, but let's be real, none of that stuff is good enough to change what's happening. But, the sad truth is that nothing more will happen. Humans are going to run ourselves into burning and or starving to death very soon and world leaders are all just sitting back thinking about making more money.

Why are more people not demanding immediate and big changes?

This is literally life or death people.

Sorry for the rant but I'm stressed.

Oh and if you believe humans will never go extinct or won't for thousands of years, why do you believe this?