I could be majorly misunderstanding how it works, but as far as I'm aware plants/trees are not really a solution. Plants are part of the carbon cycle and the issues is that we took sequestered carbon and injected it into the carbon cycle. To make plants a solution you would need to take all the plant matter after the plants die and sequester it somewhere where it can't decompose. I think planting trees helps delay large scale issues, but it doesn't actually solve the problem. Maybe there's some increased plant to land area ratio that means a larger percent of the carbon in the carbon cycle is always spent in solid plant form? Even if that's the case it requires always maintaining this amount of plants even as populations grow or cutting down trees after they grow and storing the wood in a vacuum chamber or something like that.