Independent: On the evening of 19 March the lights went out not just all over Europe, but throughout the world. But far from being a harbinger of doom as in Sir Edward Greys celebrated observation on the eve of the First World War it was a sign that one of the worlds most perilous, impending problems might yet be solved.
Scores of millions of people in a record 178 countries switched off at 8.30pm last night, to mark this years Earth Hour, participating in the worlds biggest ever demonstration to stop...