Earth Hour, the global switch-off at 8.30 on Saturday night to raise awareness of climate change, was aiming to get 1bn people to join in this year. It is not clear yet how many took part, but there is some good video available from events in several cities in Europe and Oceania. It is noticeable, though, that the famous landmarks being switched off, the Eiffel Tower and so on, are generally clearly visible in silhouette against the blaze of lights still burning around them. (Except in New Zealand, where it looks as though they were really going for it, with lots of candles and acoustic guitars.)
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