you seem to have a basic grasp of science but are missing the key points of man made climate change which is related to atmospheric greenhouse gasses.
An increase in atmospheric greenhouse gasses can increases temperature and pressure.
For example this is why Istanbul which is almost the same latitude as Mt Everest, has a much warmer temperature and higher pressure then Everest, this is because there is less atmospheric gasses above it so much less greenhouse effect at Everest elevation even though it is technically closer to the sun... same as why night time on Venus is hundreds of degrees hotter then on Mercury that is much closer to the sun.
Sure you can argue its fine for life to have much higher CO2 and temps, and yes thats correct, but as
@tangs has pointed out it would have dire effects for the current species that populate earth...
