Finally, America is taking climate action seriously. Pragmatism is the way forward | Ruth Greenspan Bell

The United States is one of the countries that is most responsible for producing greenhouse gas emissions - now it wants to be part of the solution

America has demonstrated a new level of maturity about tackling climate change. Winston Churchill famously said: "You can always count on Americans to do the right thing - after they've tried everything else."

Churchill could have been speaking about the progress of negotiating global climate policy - not just the American role but the entire two-decades-long process.