This is
called afforestation, and as I mentioned in the piece, it has already happened on a large scale in the eastern United States, the former Soviet Union, China and some other areas.
It reiterates — also with «high confidence» — earlier
calls for «an integrated approach» that includes «reducing CO2 emissions by reducing deforestation, forest degradation and forest fires; storing carbon in terrestrial systems (for example, through
afforestation); and providing bioenergy feedstocks.»