"Reforestation is a prominent climate change mitigation strategy, but available global maps of reforestation potential are widely criticized and highly variable, which limits their ability to provide robust estimates of both the locations and total area of opportunity"
Wikipedia says "Globally, planted forests increased from 4.1% to 7.0% of the total forest area between 1990 and 2015." And the Green Wall in China is arguably doing cool things.
Reforestation might not solve our issues, but I don't see "nonsense."