GIGA is a brand-new nonprofit whose website launches this week. It stands for Green Ideas, Green Actions. Standard eco-fare, right? Except that it's coming out of a city of 20 million -- in China (where Huffington Post is often blocked). We could start with the fact that over the next five years, more people will move into urban spaces in China than the entire population of the United States (an estimated 350 million). Or we could start with a room in central Shanghai, in a p