I don't mean to sound so bleak. Sometimes human civilization does take a great leap forward and that could still happen. One thing that comforts me is to remember that we aren't really outside the natural world even though our self awareness makes it seem so. Are we really any different than a herd of deer that overpopulates and dies off as result? I would argue we aren't. Not in any way that matters, we're just self aware enough to know we are doing it, but not in control enough to stop it.
As one of my physics teachers used to say, the planet itself will be just fine. Some people think that's an obnoxious viewpoint, but I see it like there have been other mass extinctions and yet life flourishes. There is hope for life itself on this planet even if it isn't human or particularly intelligent. A quarter of a billion years from now there might be an amazing amount of biodiversity on Earth.
Another bright point is that I'm guessing you and I won't be around to see things get really bad even if we don't change course. I feel bad for my potential grandchildren though. If we don't turn this ship around things are going to get real mid-century, not to deny that we can see the beginning of change now. Anyway, who knows? There could be technological advancements that slow down climate change/pollution. I really do believe that's possible, given how fast tech has advanced just in the last 100 years.