Guardian: Climate science is under assault, progress towards a treaty to end global warming is shuddering to a halt, and Barack Obama is struggling to press on with his clean energy agenda. This was the last conversion to the environmental cause that anybody would have wanted. In a new audiotape that surfaced today on the al-Jazeera network, Osama bin Laden has pronounced himself a believer in climate change and blames America and other industrialised economies for failing to rein in …