(L to R) The Bank of China building, the

(L to R) The Bank of China building, the Cheung Kong Centre, the HSBC Building and the Standard Chartered Bank building are lit up as they tower over the colonial Legislative Council building (bottom L) just before "Earth Hour" in Hong Kong on March 28, 2009. Thousands of towns and cities across the globe were to observe an hour without light to mark Earth Hour, a global grassroots movement that began in Australia two years ago, when 2.2 million people switched off their lights in Sydney. AFP PHOTO / Mike CLARKE (Photo credit should read MIKE CLARKE/AFP via Getty Images)