Reuters: Developing nations will need at least $267 billion a year by 2020 to fight climate change and adapt to droughts, heat waves and rising seas, according to African nations. The figure, part of a new African text for negotiations on a U.N. climate treaty, is more than double current development aid from recession-hit rich nations which totalled a record $120 billion in 2008. “Africa is one of the most vulnerable continents to climate change, with major development and poverty …