Independent: Facing down a recalcitrant US Congress as well as a sceptical American public, President Barack Obama has unveiled a swathe of measures designed finally to put his administrations back into tackling global warming, notably imposing strict new curbs on carbon dioxide emissions from electricity-generating plants. The measures, which can be implemented without recourse to any votes by Congress, had been widely expected and were harshly criticised by the presidents Republican critics even before he...