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President Obama Explains How Pollution Affects Our Planet

Key Facts In This Video

  1. NASA's Aura satellite orbits Earth to study the ozone layer. 00:07

  2. The United States and Europe have some of the highest emission levels in the world. 00:21

  3. Over the last 25 years, nitrogen dioxide levels have dropped by up to 50% in the U.S. and Europe. 00:26