"When you start messing around with these natural systems, you can end up in situations where it's unstoppable. There are no brakes you can apply," said David Viner, a senior scientist at the Climatic Research Unit at the University of East Anglia.
"This is a big deal because you can't put the permafrost back once it's gone. The causal effect is human activity and it will ramp up temperatures even more than our emissions are doing."
In its last major report in 2001, the intergovernmental panel on climate change predicted a rise in global temperatures of 1.4C-5.8C between 1990 and 2100, but the estimate only takes account of global warming driven by known greenhouse gas emissions.
"These positive feedbacks with landmasses weren't known about then. They had no idea how much they would add to global warming," said Dr Viner..."
Los gobiernos del mundo han estado debatiendo el cambio climático desde la Cumbre de la Tierra de 1992 en Río de Janeiro. En 1997 se creó el Protocolo de Kioto y hasta 2005 entró en vigor, pero sin la ratificación de los países contaminantes claves, como Estados Unidos y Australia.
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