The way I stop myself from freaking out is to realise that we're all going to die anyway, all of us, including rich people. Most of us have about 60 to 100 years, then that's it.
I don't really understand this attitude. Sure, we all die - but not all deaths are equal.
A "good death", for most people would be dying at old age from natural causes, in a comfortable, warm environment, with pain relief and palliative care if needed. Ideally surrounded by family and friends, looking back on a lifetime of joyful memories.
Then there are "bad deaths", like dying at at a young age, from malnutrition and dehydration because the soil won't produce enough food to feed everyone and clean water has become a scarce resource. Or dying of an easily preventable disease, because the healthcare system collapsed along with the environment. Or dying in a civil war caused by resource shortages.
The scale of the issue means that even those of us in the developed world won't be able to fully insulate ourselves from basic survival problems, and only the mega-rich will be able to afford to have a "good death" as described above, and probably not even them, in the worst-affected parts of the globe. If we do nothing about the wholesale environmental collapse facing us right now, we are condemning our children and grandchildren to a "bad death". That's just the reality of the situation.