The UN will be holding major climate change talks in Durban in November. Previous efforts to sign a new global treaty to cut greenhouse gas emissions have failed.
Meanwhile scientists continue to deliver stark warnings about rising global temperatures.
HARDtalk's Stephen Sackur talks to the chairman of the International Panel on Climate Change, Rajendra Pachauri.
Watch the full interview on BBC World News on Monday 25 July at 0330 GMT 0830 GMT, 1530 and 2030 GMT and on the BBC News Channel on Monday 25 July at 0430 BST and on Tuesday 26 July at 0030 BST.