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Perched on the edge of a fiord in western Norway, Statoil

John McCain vowed yesterday to put the US at the heart of international efforts to tackle global warming, proposing aggressive targets to reduce domestic greenhouse gas emissions and the creation of a cap-and-trade system to encourage investment in green technology.

President George W. Bush on Wednesday proposed a target of stopping growth in US greenhouse gas emissions by 2025, delivering his opening shot in negotiations with the US Congress and international community about climate change. The target marked the most specific goal yet set by the Bush administration for curbing carbon emissions, but fell short of more aggressive targets set by European countries and proposed by Democrats in Congress.