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.

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.

As long as nation-states have distinctly different levels of energy-dependent economic development, and their self-interests are so varied, there is really no basis for the mutuality of interest required for a meaningful treaty. 
 

The impact of Ban Ki-moon’s New York summit on UN efforts to curb climate change faces its first test on Monday in Bonn, where envoys from over 190 countries meet for a week of negotiations.

Climates marches were held across the globe on Sunday, from Paris to Papua New Guinea, and with world leaders gathering at the United Nations on Tuesday for a climate summit meeting, marchers said the timing was right for the populist message in support of limits on carbon emissions. The signs that marchers held were as varied as the movement: “There is No Planet B,” “Forests Not for Sale” and “Jobs, Justice, Clean Energy.”

Climate change is an area that should ultimately bring the two nations closer together even more than cooperation on energy. If the world’s two largest economies, and two most powerful nations, can’t come together to address this very real threat to human civilization, then what can they achieve together?