So the thing about trees is, there are right ways and wrong ways to plant them. It should be obvious that plantng a tree in a desert won’t just lead to a forest, but the same is true to a lesser degree in most locations. It is necessary to choose the right locations that will have water available, and good soil, and some other conditions for the trees to thrive.

Companies doing it will most likely just dump a bunch of seeds or saplings in an area that won’t support long term growth, claim the numbers, and then let the trees die off.