I agree it's a complex problem that needs to be tackled on many fronts. But the great thing about trees is we like forests, they're economical to plant, and they buy us time. If we remove 2/3 of the carbon added to the atmosphere since the industrial revolution, it buys us 20 years at current emissions. In 20 years the demand for internal combustion vehicles will be nearly dead. Coal plants are already in serious decline, but in 20 years they'll probably need subsidies just to keep running. With the pace of advancements in renewable energy and electric vehicles, 20 years is enough to go from we don't know how we'll solve this problem to the problem is solving itself through free-market forces.