Decarbonization will have negative externalities. Yes, even environmental ones. I'd argue that those externalities are necessary and delay to mitigate them is going to be worse than fixing them later.
It sure isn't going to help with all the other things we are doing in parallel.
Soil exhaustion, poisoning, and erosion; groundwater depletion and poisoning; deforestation; wild ecosystem destruction and food web destabilization; coastal sea surface and seabed destruction; river and lake poisoning; acid rain; carting invasive species around the world willy-nilly; anoxic ocean zones; hunting fish species to extinction; the ruinous effects of mineral and sand mining... all in parallel with the effects of extra carbon in the atmosphere.
The point is that reducing car usage / dependency would solve both. Just switching to EVs doesn't really solve that much, except it saves the car industry.
Soil exhaustion, poisoning, and erosion; groundwater depletion and poisoning; deforestation; wild ecosystem destruction and food web destabilization; coastal sea surface and seabed destruction; river and lake poisoning; acid rain; carting invasive species around the world willy-nilly; anoxic ocean zones; hunting fish species to extinction; the ruinous effects of mineral and sand mining... all in parallel with the effects of extra carbon in the atmosphere.
Just to put things in context.