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Makes sense, but they do affect the insolation, and thus kill life on earth.
We can't live without it, but we can't live with to much of it. So if we are pushing the upwards bounds.. which way should we go? Only one logical choice if you want our current life forms to exist.
I never said we can't live without fossil-fuel powered vehicles. We certainly can go full electric, and we can broadly adopt solar, wind, wave, and tidal energy sources. We can use the Fischer-Tropsch process to produce synthetic hydrocarbon fuels and lubricants from biomass and leaking methane deposits instead of crude oil or coal. (Methane is a much more potent greenhouse gas than CO2; we currently try to "flare" methane sources to produce CO2 rather than allow them to vent naturally. It makes far more sense to use these sources productively than to simply burn them off.)
So what your saying is we need cars powered by cow flatulence. /s