The nasty thing about global warming is that it's weakening the jet stream. This causes places to one year have crazy amounts of years and the next drought. The rainy years, things grow like crazy! Lots of growth. On drought all that new growth dries up and is tinder for forest fires.

We need more trees for sure, but at the same time would would need to put huge efforts in forest fire prevention otherwise poof, all that hard work trees do sequestering CO2 literally goes up in smoke.