The United States is blocking efforts to get next month's Group of Eight summit to agree targets for cutting carbon emissions over the next 20 years, according to a draft of the declaration seen by Reuters. The draft, dated May 5, shows that Washington wants to make the Major Emitters grouping set up by US President George W Bush last year the main forum for climate action, taking the initiative away from the smaller group of rich nations. "We would be prepared to address mid-term goals in the G8 only if the Major Economies Leaders Statement does not do so and only in a way that points to the need for commitments from major emerging economies," said a US comment in the draft. In the draft for the July 7-9 summit at Hokkaido in Japan, the US endorses expansion of civil nuclear power as a low carbon technology and says biofuels are not the main cause of the recent surge in world food prices.