First established in 1970, Earth Day is celebrated worldwide on April 22nd every year to celebrate and support the protection of the environment. Has it worked?
Ralph Rosenberg, Executive Director of the Iowa Environmental Council, says Earth Day has evolved from raising awareness, to sparking action, to returning results.
"There's an urgency now," says Rosenberg. "People have seen some progress in 46 years, but we do need to see awareness and action year-round."