CO2 isn't stored in dead trees, and forests do not just keep sequestering more and more. If you hold the number of trees constant, you're not affecting the carb

CO2 isn't stored in dead trees, and forests do not just keep sequestering more and more. If you hold the number of trees constant, you're not affecting the carbon cycle. Living trees are a reservoir of carbon. If you increase the total number of trees, that increases the size of this reservoir. A forest "moving" over the course of time is a non-issue. There are immense areas on Earth right now which were deforested within the past few centuries and are still perfectly capable of supporting forest today.