You are actually spot on

As long as we don't remove fossil fuel usage, planting trees is just something to make us feel better without actually fixing the problem.

Also, you can plant as much as you want, it's going to be much less than what's burned by planters in amazon's forest alone, and they are actually burning the wood.

The main take-away is that destroying something is always several orders of magnitude easier than building that thing, and as long as we don't stop destroying we won't manage to build at a faster rate, therefore stop deluding yourselves.