This is what we need, and this is what we know the US, more than any country in the world, is capable of providing, including leadership for the 'fast start' strategies needed to avoid abrupt climate change.
We also can slow down climate change by attacking black carbon, or soot, which is killing millions of people around the world every year
We know we are getting close to the point-of-no-return for abrupt climate change from the melting of the Arctic Ice and disintegration of the Greenland Ice Sheet, and we know that one of the best way to slow this down is to strengthen the Montreal Protocol.
A non-linear tipping point is like the final step we take as we walk off a cliff. Once we take that step, we are not able to go back. It is irreversible.
Immediate, 'fast-start' mitigation is the best adaptation strategy, and if we get started today, we can buy precious time to avoid passing the tipping points for abrupt climate change.