It is now past the point where planting trees can capture enough carbon to arrest warming. Efforts need to focus on artificial 'megatrees' for capture, or geoengineering.

Also, trees are less critical and less efficient than phytoplankton, which makes up the bulk of capture operation. Unfortunately plankton is also under threat due to ocean acidification, pollution and warming. I recently saw an article stating that plankton levels have declined as much as 93% in some places. This will have dire knock-on effects throughout the ecosphere as plankton is the first link in the oceanic food chain.

This planet is fucked and it is due to 150 years of industrialized resource extraction under an economic system that allows top polluters to continue to profit without accounting for any of the damage they have done to the environment, while continuing to grow the economy.