Reuters: Carbon markets and taxes on foreign exchange deals or plane tickets are among suggested sources for a promised $100 billion a year from 2020 to help poor nations fight climate change, a draft report by U.N. advisers said. The draft, obtained by Reuters on Friday, showed that the group co-chaired by Norwegian Prime Minister Jens Stoltenberg and Ethiopian Prime Minister Meles Zenawi reckoned that both the public and private sectors would have to be tapped for cash. Industrialized nations promised…