I like how you're thinking from a hobbyist standpoint.

The teaspoon analogy (below) is a little flawed. It discounts technology improvement/growth.

You also have to include that:

1. teaspoon tech is in its infancy

2. if teaspoons were a few orders of magnitude cheaper and bigger, the job would be done rapidly

3. teaspoon tech has lots of promising pathways that haven't been followed

Carbon removal tech was $1,000/ton a few years ago, now it's ~$200/ton. Draw a line through those points and you might get somewhere interesting.