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Turning Out the Lights to Drive a Message

It's the one time lights go out all around the globe at 8:30 p.m. local time - Earth Hour. It's all part of an effort to help fight climate change and raise awareness about energy consumption.

During Earth Hour 2010, Walgreens massive billboard in New York's Times Square went dark along with Walgreens store lights in dozens of cities across the country.

According to electrical utility company ComEd, last year's efforts of Chicago businesses, buildings and individuals resulted in electricity savings of 818 megawatt hours - the carbon emissions equivalent of taking 1 million cars off the road for one hour or planting 158 acres of trees.