Youre presupposing that were losing something by cleaning up the environment. As if we cant invest in a cleaner environment the same way we spent money of the other things that made the pollution. Its absolutely possible to have all these things.
The point is that we are ALREADY paying more for living in a polluted world than a clean one. Pollution causes so many widespread health problems that we'd make that money back on healthcare costs alone.
Thats what makes this environment discussion so nonsensical. We dont even have to address climate change to get a return on our investment in cleaning up the world.