[samus]

The CO2 content of the athmosphere is actually not that high, nor will it be at the end of the century even if we don't reduce global emissions. The problem is that it is quite enough already to cause climate change. Which would also not be such a big deal if not coupled with large-scale destruction of ecosystems and our dependence on non-renewable resources.

[candeira]

I didn't literally mean the atmosphere had a limited capacity to hold this much CO2 and no more.

Please add "without existential-level consequences", which was the implied meaning.