
The recent agreement between China and the United States removes a large stumbling block for a more widespread climate change treaty. Without the two largest polluters, any other agreement was bound to have a limited effect, no matter how stringent the requirements or severe the cuts in emissions. Now that both China and the United States have agreed bilaterally to tackle the issue, it eases the process going forward.
Unfortunately, significant damage is done already done, and the best we can hope with existing technology is mitigation and adaptation to damage. The only way to reverse some of the damage is to actively remove more carbon from the atmosphere then we emit. This is a monumental task, and technology to do this is at its most nascent stages.
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Optimism Faces Grave Realities at Climate Talks
“I was encouraged by the U.S.-China agreement,” said Michael Oppenheimer, a professor of geosciences and international affairs at Princeton University and a member of the United Nations Intergovernmental Panel on Climate Change, a global body of scientists that produces regular reports on the state of climate science. But he expressed doubts that the threshold rise in global temperature could be prevented.
“What’s already baked in are substantial changes to ecosystems, large-scale transformations,” Mr. Oppenheimer said. He cited losses of coral reef systems and ice sheets, and lowering crop yields.
Still, absent a deal, “Things could get a lot worse,” Mr. Oppenheimer added. Beyond the 3.6 degree threshold, he said, the aggregate cost “to the global economy — rich countries as well as poor countries — rises rapidly.”



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