inputs: hypothesis: The Empire State Building joined the Earth Hour initiative. premise: Earth Hour 2009 takes place Saturday, March 28, 2009 between 8:30 to 9:30 pm local time when communities will participate by turning out their lights starting in New Zealand and progressing along time zones around the world. Earth Hour began as a symbolic initiative against global warming by the World Wide Fund for Nature (WWF). "[It is] The largest demonstration of public concern about climate change ever attempted." Ban Ki-moon, United Nations Secretary-General said. Earth Hour began in 2007 with around 2 million participating, and increased to about 50 million in 2008. The Empire State Building, Las Vegas Strip, the Eiffel Tower, Petronas Twin Towers, the Peace Tower, the Parliament Buildings, the Christ the Redeemer statue, Acropolis of Athens, the Egyptian pyramids, and the Colosseum are some notable landmarks which will honour Earth Hour Saturday evening.