You're right about methane; that's much more difficult to find data on, though, especially with regard to how much would be released and at what point. But if t

You're right about methane; that's much more difficult to find data on, though, especially with regard to how much would be released and at what point. But if those tipping points get hit, then nothing CO2 related will save us. Feedback loops here dying down I'll classify under the "hope they're included in the miracle that gave us zero carbon emissions" :) I'm not convinced on your second point; I'll need to see more data. I read the paper you linked, it doesn't give hard numbers, so it's difficult to compare the net loss of carbon flux in the amazon, to gain of carbon flux in other areas that are getting net-reforested, such as the eastern United States. Examples of local areas flipping from sink to source, and others becoming larger sinks, don't paint a clear picture of the directionality of the whole system.