Living on Earth: GELLERMAN: Secretary of State Hillary Clinton is on her way to China. It’s her first trip overseas as the top U.S diplomat and near the top of her agenda is climate change. China and the United States are the world’s biggest producers of greenhouse gases and any hope of a global agreement to reduce emissions will require getting the industrial rivals to find common ground — it’s a task made a lot tougher by the current economic downturn. But as Living on Earth’s Jeff Young …