After two decades of international meetings on climate change have failed to reach consensus, the environmental world is beginning to sense a change in direction.
The impacts of climate change no longer are being projected, they are being observed and measured, especially by those with the most to lose: corporations, cities and states.
Former climate change negotiators and the United States' top environmental officials say they have seen a new bottom-up push from a growing chorus of non-state actors making moves ahead of any broad international treaty that leaders hope to arrive at next year in Paris.
[...] James Cameron, principal of Climate Change Capital, an asset management firm in London, was present at the United Nations Framework Convention on Climate Change in 1992 with Esty, and he views things through a similar lens.
"These things never run in a linear fashion. They move in ebbs and flows, eddies and flurries, motions that are almost circular," he said.
He sees the lack of success from international negotiators creating a power vacuum.
"All of this power has shifted and disseminated," Cameron said, "and deep down we know that if we want to get climate change done, we have to put together a wide range of interests, and they are not contained within the borders of sovereign states."