This April 15,2013 photo shows the hazy skyline of Los Angeles seen from Mount Wilson, Calif., Monday, April 15, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)

Associated Press
This April 15,2013 photo shows the hazy skyline of Los Angeles seen from Mount Wilson, Calif., Monday, April 15, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)
This April 15,2013 photo shows the hazy skyline of Los Angeles seen from Mount Wilson, Calif., Monday, April 15, 2013. A mile above this city, sensors gaze down on the basin from atop Mount Wilson the way a satellite fixates on Earth, collecting pieces of information about Los Angeles' carbon footprint. (AP Photo/Jae C. Hong)
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