When Chinese president Hu Jintao visited the US this month, many issues made headlines, but one that didn’t is nonetheless important: clean energy cooperation, competition, or both. This issue is a litmus test for the two superpowers’ ability to build a partnership based on mutual needs and opportunities. The outcome will affect our global economic, environmental and geopolitical future, and may influence the range of clean energy opportunities for emerging economies in fundamental ways.
Cooperation  does exist between the US and China, with longstanding joint work on energy efficiency standards, and through a new but underfunded US-China Clean Energy Research Center . But the game has to be raised with higher-profile actions. Far more can be gained globally if a spirit of cooperation permeates the high-level political dialogue. These are not the only two nations to watch, but because they are the two largest emitters of greenhouse gases, and the two largest economies on the planet, signs of a shared vision of the future would mean a great deal.
The two countries need each other to build the clean energy economy. China  needs energy to grow, and can drive the exponential growth needed to move renewable energy to the center of the global energy system. The US has a nimble and deep research and development system, and serial innovators and entrepreneurs whose Silicon Valley mentality has created wealth many times over. US capital market and enterprise management capacities are huge.
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