Honestly, you can do a similar calculation for things like trees and algae. But the thing is that we didn't get that carbon from thin air in the first place. We dug it out of the ground. I'm not sure how much we mine every year, but I wouldn't be surprised if we mined a "mountain range" per decade.
Also I think your mountain estimate is off. Mt Everest is 158.76 gigatons (~350e12 lbs). I don't think this detracts from your point (that's a TON of mass each year) but I thought I'd make the correction. I mean we're still talking half an Everest every year.
For reference, I did also find a source that says we mine between 32 and 50 billion tonnes of aggregate (sand and gravel) every year. So maybe 80 isn't that bad?
Also I think your mountain estimate is off. Mt Everest is 158.76 gigatons (~350e12 lbs). I don't think this detracts from your point (that's a TON of mass each year) but I thought I'd make the correction. I mean we're still talking half an Everest every year.
For reference, I did also find a source that says we mine between 32 and 50 billion tonnes of aggregate (sand and gravel) every year. So maybe 80 isn't that bad?