Speaking on International Earth Day, President Obama has declared the United States must lead the world on renewable energy. In a move he said would help the environment and create jobs, the President has opened the door to offshore wind power generation and pledged US commitment to global climate talks.“On this Earth Day, it is time for us to lay a new foundation for economic growth by beginning a new era of energy exploration in America,” he told workers at a wind power technology plant in Iowa. “The truth is that the United States has been slow to participate in this kind of a process, working with other nations. But those days are over now.” Obama has pledged to cut US greenhouse gas emissions to 1990 levels by 2020, reversing the policies of his predecessor George W. Bush whose administration refused to ratify the Kyoto Protocol. Boosting the new president’s green credentials further, US negotiators are now preparing proposals for international climate talks to be held in Copenhagen in December, aimed at agreeing a pact to succeed Kyoto.