It's carbon neutral on the order of magnitude of a century. If we were to plant a forest in the Sahara, it'll largely be net positive capture for at least 3 decades, and then we'll be able to replace coal with that wood, making a global net zero (but we'd already have reduced co2 in the atmosphere). Replacing oil with wood would probably require quite a lot of work though (as making the desalination plants to make a forest)