American cities, states and businesses have already come a long way on the road to cutting greenhouse gas emissions. Here are four clean energy trends to watch in the coming year in cities in the U.S.

As we approach the Year of the Rat and begin a new 12-year cycle of the Chinese zodiac, three profound challenges face the world: how to build a more stable and efficient trading system, tackle climate change and protect biodiversity. China has a pivotal role to play in all three.

While very few countries are on track for achieving a zero-carbon energy system by 2050, China, Costa Rica, Denmark, Ethiopia and the United Kingdom are further along than many.