A watershed for clean energy

Two events this week will set out very different visions of Britain's future in an age of accelerating climate change and diminishing supplies of oil ? and very different views on how this country can lead the world. On Thursday Gordon Brown and Nicolas Sarkozy will meet amid much ballyhoo in the unlikely environment of Arsenal's Emirates Stadium, where they are expected to sign an agreement to build a new generation of nuclear power stations and to export the technology around the globe. And on Saturday, as we report today, a barge is set quietly to slip out of Belfast to install the world's first-ever commercial tidal power turbine in the much more attractive surroundings of Strangford Lough.