Beware Obama's climate change expert Dr Steven Koonin

As climate change negotiations wear on, we should be ready to hear more from Dr Steven Koonin, Obama's undersecretary of energy for science. He is one of the leading proponents of the idea that climate change can be combated with techno tricks like releasing sulphate and aluminium particles into the atmosphere – and of course it's all perfectly safe, just like Disneyland! He also happens to be BP's former chief scientist, the man who just 15 months ago was still overseeing the technology behind BP's supposedly safe charge into deepwater drilling.