Reuters: Almost 50 nations made progress on Friday towards a “Green Fund” to help poor countries fight global warming but hosts Mexico and Switzerland said a full U.N. climate treaty was out of reach for 2010. Environment ministers and senior officials meeting in Geneva also examined how to raise a promised $100 billion a year in climate aid from 2020 — perhaps from carbon markets, higher plane fares or taxes on shipping — to be managed by the Fund. “We think we should be able to …