I'm glad I'm going to be dead in about 20 years, but I fear for my children.
Your children and their children will simply adapt to changing conditions and crack on - as all species and ecosystems have done for millions of years. Of course being born into a "changed" environment will mean that that generation will regard that environment as "normal", so they will have a different baseline to us.
E.g. I imagine life must have been pretty horrible in northern Europe during the low parts of the mini ice age in the 17th century, given that most folk were already living on a knife edge as subsistence farmers to begin with. However most of them seem to have survived long enough to create our generations, and they regarded their environment as so "normal" that they didn't record much about it and we've had to deduce it from scientific data.
Maybe there will be unpleasant human population stress due to climate change in some of the world's vastly overpopulated zones - but that will arguably occur anyway with or without climate change as an added factor. Those zones are probably not biologically sustainable in any case.