The carbon sequestered in the earth in the form of coal, oil and gas hasn't always been in the earth. After all, hydro carbons are in fact hundreds of millions of years of dead trees buried under mud sequestering atmospheric CO2. Which implies there was a time with all that CO2 in the air yet still trees to capture it. By releasing it all, we reset the biosphere's clock to about a time when earth supported a different kind of life (one without us in it), but life nonetheless.
Frankly, the comparisons to Mars and Venus seem a bit overblown.
You lost the argument right here. Language is as fundamental to culture as the sky is blue.
The rest of your post amounts to "communication is important to function" and you are not wrong on that front. But you put no weight on the importance of culture too.
Consider this your wakeup call, that just because you don't personally care about society having an identity doesn't mean the rest of us don't.