David Cameron says cash spread over five years will come out of foreign aid budget as he meets Ban Ki-moon and François Hollande at UNSunday 27 September 2015 12.00 EDTLast modified on Sunday 27 September 2015 12.03 EDTAlmost £6bn of the UK’s foreign aid budget will be spent on tackling climate change in poor countries over the next five years, David Cameron has said, as Britain steps up its contributions by 50% to help meet…