Time: New York Mayor Michael R. Bloomberg was the belle of the ball this morning at a international climate change conference here in Hong Kong. He was here as the new chair of the C40 Cities Climate Leadership Group, a group of 40 cities worldwide committed to tackling climate change. (Here’s a map of participating cities.) Bloomberg shared the stage at the Hong Kong Convention Center in a brief roundtable with (freshly ousted) Toronto mayor David Miller, Johannesburg major Amos Masondo, and Edward…