There is enough, if we all share. Find the joy in living with enough. But we can hardly imagine how to do that. We think the economy would collapse if we even tried, though in fact the economy is much more likely to collapse if we keep tearing down its essential resources. So it can be tempting to deny the whole problem.
Some people make careers of denial.
They say environmental problems are exaggerated. Human life expectancy is rising, they point out, and they are right. We are richer every day. We keep discovering more resources. Sure, there are a few messes to clean up, but better technology and more money will do that.