Earth Day Evolution

<div class="meta image-caption"><div class="origin-logo origin-image"><img src="http://cdn.abclocal.go.com/assets/news/global/images/logos/origin-ap.png" alt="AP"></div><span class="caption-text origin-image"><p>In this April, 22, 1970 file photo, a Pace College student in a gas mask &#34;smells&#34; a magnolia blossom in City Hall Park on Earth Day, April 22, 1970, in New York. </p></span></div>
April 22, 2010 12:27:10 PM PDT