http://event. nationalgeographic. com/greendex/index.html
driving alone car (health & environmental)
walking and biking (health & environmental)
public transportation (environmental)
ranking transportation (health & environmental)
http://event. nationalgeographic. com/greendex/index.html
driving alone car (health & environmental)
walking and biking (health & environmental)
public transportation (environmental)
ranking transportation (health & environmental)
heaven = bike green
usa earth=auto pollutants
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