You seem to forget that 100 years ago it was also used much less.

billions of light polluters today is much worse than a couple of heavy polluters 100 years ago.

That is a different issue that doesn't have to do with tech itself. But I will also note that our population growth trajectory 100 years ago looked much more pessimistic than the one today.

Now I don't think any of this will be enough to avoid a major catastrophe due to AGW. But it's also clear from experience that, between tech advances and social self-control, the former is far more likely to happen at scale, and thus have any meaningful effect.