Were You In the Dark for Earth Hour?

For one hour on Saturday, New York City's Empire State Building went nearly black, the Eiffel Tower did not light up the Paris sky, and the clock hands of Big Ben were almost invisible in the London darkness. According to the World Wildlife Fund, hundreds of millions of people turned off their lights at 8:30 p.m. GMT in honor of the fourth annual Earth Hour, the event's largest turnout yet.

One-hundred twenty-six countries and 4,000 towns participated in Earth Hour 2010, an event meant to raise awareness of global warming and climate change, turning off the lights in skyscrapers and famous landmarks. Media outlets all over the world covered local participation in the event, which was mentioned on Google 74.6 million times in 24 hours.

--Jessi Phillips