Reuters: Success in winning China’s help with global tasks like reviving the world economy or fighting climate change can depend on which China you’re talking to: the established economic powerhouse or the developing country. China the new power holds $2 trillion (1.34 trillion pounds) in foreign reserves, including about $1 trillion in U.S. debt, and increasingly lectures rich nations on economic management. Developing China has tens of millions of rural poor among its 1.3 billion people and …