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Earth Hour is a time for citizens worldwide to take small environmental steps that lead to bigger environmental steps. The idea is simple: for an hour we all turn out the lights, unplug electronics, park our cars and take other actions to conserve energy and cut greenhouse gases that cause climate change.

Earth Hour 2013 happens this Saturday, March 23rdfrom 8:30-9:30 PM local time. The event was created by the World Wildlife Fund in 2007 and has grown into a global phenomenon. Last year, about 200 million people took part in Earth Hour from 152 countries.

The Earth Hour movement builds on the momentum it creates. Earth Hour now has an “I Will if You Will” campaign where hundreds of citizens challenge each other or members of their organization to take broader environmental steps that will carry on well past one hour.

Can you take steps beyond turning out the lights for an hour? Go here for ideas on the “I Will if You Will” challenge: