What people don't realize is that the extinction of humanity has already begun. The population is going to start plummeting as the rate of people not having children accelerates and the elderly start dying off. As climate change worsens, food production is going to procedurally decrease, and as the workforce shrinks logistics will fail. There will be widespread famine, people are going to be priced out of being able to eat. There will be violence over this, but the damage is done--no amount of revolution will be enough to restore the production and transportation of food to high enough levels to feed everyone. As more and more people die off, the problem will only accelerate. "Oh rich people will survive", people say. Sure, but for how long? With a global failure of logistics and communication, it's not like your money would really be able to buy much, if you can even access your wealth. Humanity is fucked, enjoy life while you can now. If you can.
I do what I can, reduce consumption and minimize waste, but it's not like it'll matter. It's still worth it to try, though. It's like a heroic last stand, just on a much much much slower and less glorious scale.