<http://schema.org/description>
"Earth Day 1970 didn&amp;#039;t have the low-key feel of today&amp;#039;s celebration. It was a time for protest -- some of it violent. How did Earth Day transform from a day of dissent to one of public service?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/environmental/green-science/earth-day-evolve.htm>