We are most optimistic about the commitment made by President Obama, who has said that the US will lead in the climate change talks. His Secretary of State has said that the US is determined to see that the talks produce a result, and we are confident that it will play a proper part.

My hon. Friend is correct about the Bill—it has been somewhat watered down—and we are encouraging the Administration to have the greatest possible ambition: they are engaged; they accept the science; and they have negotiators with a positive approach. We believe that we will be able to achieve a global deal. It will be important that there is a commitment by the US to make the emissions reduction that is required by 2050, which is 80 per cent. for developed countries. Already, the President has said that the US can make that commitment. It is in a difficult situation because of the history under the previous Administration. We understand that, but there is a great deal of good will. This is a matter of negotiation, and we will continue to press the Administration for the greatest possible ambition.