But this movement is now tinged with nervousness in some circles. New research and reporting, focused on a few poorly conceived reforestation projects, has raised questions about the ability to responsibly reforest billions more trees each year in ways that will be ecologically appropriate and climate resilient.

Even when natural regen does occur, the mix of tree species that grows back might not be climate resilient.And some 2nd growth can be more vulnerable due to invasive shrubs & grasses. In such cases, we need to be ready to give nature a helping hand.