There are ways to mitigate it for future dams. No, they aren't all emitted, it takes decades for trees to break down in an aerobic environment. Anaerobic is 4

There are ways to mitigate it for future dams. No, they aren't all emitted, it takes decades for trees to break down in an aerobic environment. Anaerobic is 4 times longer. Most trees in the BC/Quebec areas that were flooded take at minimum 40 years to decay in an aerobic environment. Here's one about the Curuá-Una dam in Brazil: https://link.springer.com/article/10.1007/s11027-005-7303-7 https://link.springer.com/article/10.1007/s11027-005-7303-7 Key phrase: In 1990 (13 years after filling), the Curuá-Una Dam emitted 3.6 times more greenhouse gases than would have been emitted by generating the same amount of electricity from oil.