Trees don’t lock CO2 away long term they store it only temporarily. At the end end of thier lives most trees will rot or be burned releasing the CO2 back into the atmosphere. There are exceptions but they’re rare and endangered environments due to human activity.
Trees die. They then either burn or rot and release greenhouse gases. This idea particularly true i. The great rainforests. The soil layer is poor. It stores minimal CO2.
However peat marsh and mangrove forests do lock CO2 away. The problem both is that they’re rare environments. The peat has been dug up for millennia as fuel and the mangrove forests are sensitive to pollution.
That’s not to say it doesn’t play a role but most trees store CO2 for a little over thier lifetimes and forests as a whole release the same CO2 at a similar rate.
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