There is this, however, as mdorazio notes: > Potential drivers in the category of increased emissions include emissions from intensive agricultural practices,

There is this, however, as mdorazio notes: > Potential drivers in the category of increased emissions include emissions from intensive agricultural practices, emissions from oil and gas operations, and increased emissions from wetlands responding to global warming. [This last potential driver is particularly worrisome as it implies the engagement of a global warming feedback loop.] So maybe "wetlands" is a veiled reference to permafrost. Which in fact are basically frozen wetlands.