This article describes another of the plausible “positive feedback” processes which could lead to runaway warming. Source: Scientific American, August 29, 2006 Since time immemorial, methane and oil have seeped from beds buried beneath the ocean sediment off the California coast. The methane bubbles up and out of the sea, adding to the store of greenhouse gases in the earth’s atmosphere. The oil floats up as well and, over time, breaks down into tar...

