What's wrong with trees?

Doing it at scale, with trees, is called a "tree plantation". Lumber companies already have a lot of those, and ruthlessly optimize them for profit.

Vs. environmentalists vastly prefer natural forests. For example: https://www.sciencedirect.com/science/article/pii/S037811272...

Nothing at all! But it requires careful forest management and people often don’t understand how young growth wood is an infinitely sustainably resource… knee jerk reaction is oh that’s bad

Trees die, and turn back into CO2

Not if you build houses from them.