At a press conference on Wednesday, top U.S. climate envoy Todd Stern explained to reporters in Durban that he sees the goal of limiting global warming to less than two degrees Celsius above pre-industrial levels — more than double the amount of existing warming — as a “guidepost,” instead of “some kind of mandatory obligation”:
I think that we look at two degrees as an important and serious goal which ought to guide what we do, which ought to guide the action that we take in order to try and attain it. That is — so it’s important, it’s serious, and it’s a guidepost I would say. That is still different from looking at it as an operational cap that you must meet, and that if you, you know, see yourself off of it based on science, then you have some kind of mandatory obligation to change what you’re doing, whether you’re in the United States, or Europe, or China, wherever you might be. I think you have — I mean, I think as we look at science, and we see the trajectories, it ought to inform our sense of what needs to be done. It might well cause us or anybody else to say, jeez, we need to do more. But we don’t see it as akin to a national target.
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At the beginning of the Durban climate talks, U.S. climate negotiator Jonathan Pershing brushed aside concerns that commitments made under the Cancun agreements in 2010 put the world on a pathway much higher than 2°C, arguing there are “essentially an infinite number of pathways” that allow stronger cuts starting in 2020 to “stay below 2 degrees.” Pershing later conceded that it is “desirable to do a great deal earlier” but argued the negotiators have to be “politically pragmatic.”
With less than 1°C warming, we are already experiencing dangerous climate change, as evidenced by the rapid increase in catastrophic extreme weather, rapid changes in ecosystems, rapid sea level rise, rapid ocean acidification, agricultural productivity decline, rapid polar and glacial ice loss, and other guideposts for the viability of modern human civilization and global biodiversity. Although 2°C warming — which would involve much greater local warming in the Northern hemisphere — is “not safe,” going higher would make “large-scale discontinuities” likely that create conditions “incompatible with an organized global community.”

This morning, Todd Stern, the U.S. special envoy for climate change, spoke on the special challenges and opportunities for building an international climate change agreement with China, now the world’s top emitter of global warming pollution. In a 