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Why you should listen to her: Majora Carter is a visionary voice in city planning who views urban renewal through an environmental lens. The South Bronx native draws a direct connection between ecological, economic and social degradation. Hence her motto:

'productive' vs. 'luxury' carbon emission

The man who had predicted the storm was Goesta Wollin. Since the early 1970's he has been convinced that the earth's magnetism affects climate…In 1970 Wollin and a colleague, David Ericson, began to study climatic changes that have taken place since the last ice age, 11,000 years ago. By chance, the same week they finished plotting their temperature curves, an article published in Science outlined the changes in the earth's magnetic field over the identical span of time.

Incredible as this may seem, the farm is not some utopian dream; it is a reality. The crop being harvested is remarkable seaweed, the giant kelp (Macrocystis pyrifera), the fastest-growing vegetable in the world.

As attention to Earth Day picked up again in 1990, so did the frequency of events land celebrations on college campuses, in city parks and other gathering places around the world. But rather than spilling any more green ink writing about Earth Day 2009, I dug up the best Earth Day posters I could find spanning the last 39 years. As might be expected, the earlier posters were much more difficult to track down (mostly because there were fewer events to advertise). I also found the paucity of posters from the 1980's indicative of Reagan-era anti-environmentalist sentiment.