Dr. Robert Holmes ( earth system scientist at Woods Hole Research Center who studies rivers and their watersheds and how climate change and other disturbances are impacting the cycles of water and chemicals in the environment and the fate of the vast quantities of ancient carbon locked in permafrost in the Arctic, which may be released as permafrost thaws, exacerbating global warming) (2015): “It’s essential that policymakers begin to seriously consider the possibility of a substantial permafrost carbon feedback to global warming. If they don’t, I suspect that down the road we’ll all be looking at the 2°C threshold in our rear-view mirror” (John Abraham, “Methane release from melting permafrost could trigger dangerous global warming”, Guardian, 13 October 2015: http://www.theguardian.com/environment/climate-consensus-97-per-cent/2015/oct/13/methane-release-from-melting-permafrost-could-trigger-dangerous-global-warming ).