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| National Geographic: Earth Day 2011 - Digg In 1970 smog choked major U.S. cities and toxic waste flooded rivers. That same year nearly 20 million Americans participated in events on April 22, ... digg.com/.../national_geographic_earth_day_2011?... | ||
| National Geographic drives consumer engagement, revenues via ... Nonprofit giant National Geographic Society is celebrating National Parks Week and Earth Day by expanding its portfolio of mobile applications. www.mobilemarketer.com/cms/news/content/9765.html |
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