Watch Live As Scientists Debate The Benefits And Drawbacks Of GMOs With A Monsanto Executive

December 3, 2014 10:32 PM

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A group of Clark College students attempted to dramatize air pollution by taking walks around Vancouver wearing gas masks as an Earth Week project, April 21, 1970. "We’re trying to show the effects of pollution, but most ignore us," said one of them, Ken Cochran.

An estimated 7,000 people jam a quadrangle at the Independence Mall in Philadelphia, during Earth Week activities celebrating the eve of Earth Day, April 22, 1970.

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