 Feedback is when a natural process amplifies or dampens climate change. The feedback may be positive when the natural process amplifies climate change or negative when the natural process dampens climate change. An example of a positive feedback is methane dissociation in permafrost. Warming leads to the breakdown of permafrost, leading to the outgassing of methane into the atmosphere, which leads to more warming, which will in turn lead to more methane dissociation in permafrost. An example of negative feedback is the weathering cycle. Global warming amplifies weathering, and weathering draws down CO2, which will dampen further global warming.