“. These mature trees are at high risk of forest fires and store carbon less efficiently than younger trees.” My understanding is that this was disproven. Mature trees continue to sink carbon, and at a faster rate than younger trees.

Why Old-Growth Forests Store Carbon Differently https://www.ecomatcher.com/why-old-growth-forests-store-carbon-differently/

We’re way too far up the hockey stick for something like this to save us.

They would need to also build a time machine and start sinking these billions of tons of carbon all the way back in the 70’s for it to be even remotely effective now.

(This graph is outdated already, I only downloaded it a few month ago. That line is even steeper now on quite a few projections.)