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That we can affect the atmosphere is well known.
When I grew up the hole in the ozone layer was the big threat. CFC gasses were banned, old fridges were disposed of correctly and it is getting better now, no longer a big threat.
Then car emissions were to blame for forests dying and old buildings getting damaged. Catalytic converters became mandatory for all vehicles and regular emission tests are now required to be allowed to drive.
The problem with CO2 is, it's a natural gas and the effects, warming up, melting glaciers, are part of a normal natural cycle. Nature is used to change, however not at the pace we're accelerating it too. People will be able to adapt too, although not everyone has the luxury to move to a better climate or out of the way of a rising ocean.