Climate change has been at the forefront of the president’s recent diplomatic agenda. It should stay there. This week, U.S. President Barack Obama made his second visit to India. As during his trip to China last year, where he signed a landmark agreement to reduce greenhouse gas emissions, climate change ranked near the top of the agenda.

On Thursday night, climate negotiations had turned into a script for a thrilling film on international intrigue. A document so far held secret  was inadvertently leaked well before it was planned to be released by the United nations climate change convention secretariat. That set off a series of high-drama sequences which by night time, when talks were suspended again, had plunged the conference into uncertainty.

Eco-warriors on the front lines of climate diplomacy often frame the environmental conflict between the developed and the developing world as a version of the notorious skirmish between Lawrence H. Summers and José Lutzenberger, which happened on the sidelines of the Earth Summit in Rio de Janeiro in 1992, widely seen as the official start of the world’s interest in climate change.

As the world gathers in Lima to discuss next year's climate deadline, a lot of focus is on the US-China climate agreement. While alone that deal has not paved a pathway for a meaningful global agreement all the way to Paris, if you detour through New Delhi something intriguing and hopeful emerges.

Countries are meeting in Berlin today to announce how much they will give to the UN's climate adaptation fund. 

The exchange, related by a senior State Department official with direct knowledge of the Oct. 18 meeting, marked a turning point in the Obama administration’s efforts to get the world’s two biggest polluters to commit to lowering the greenhouse gas emissions causing climate change.

A pledge on Wednesday from President Xi Jinping of China to help fight climate change is expected to send a strong signal, since meeting global emissions-reduction goals will require sustained efforts from Beijing in curbing the country’s addiction to coal and greatly bolstering sources of renewable energy, analysts and policy advisers say.