Old Military Planes Could Drop 900,000 Tree-Bombs a Day

It uses a lot of trees. Visit Washington or Oregon sometime and drive through the mountains; the earth looks scarred.

However, IMO the best thing we could be doing is taking areas of desertified land and fighting it. Place moisture traps connected to irrigation pipes and grow grass, just plain old grass to bind nutrients. Spread the grass and in desert areas you'll be catching dew every morning in the traps and the grass will itself.

Once you've spread the grass, spread shrubs. The Caragana arborescens is a miracle plant for these purposes. It traps moisture, it acts as a windbreak (stopping desertification), it provides a food source (peas), it's fast growing, it's a dense-spreader. Another benefit is that it can support honey bees, which again provide food but also could increase fertility of any future farm plantations.