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One billion expected to celebrate Earth Day

  • Story Highlights
  • Its 39th anniversary, Earth Day is celebrated around the world
  • Organizers expect more than one billion people to participate
  • See the best Earth Day images from around the globe
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By Anouk Lorie
For CNN
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LONDON, England -- More than one billion people are expected to mark Earth Day Wednesday.

Debates on climate change have played a large role in increasing awareness of the environment.

Debates on climate change have played a large role in increasing awareness of the environment.

Since its creation by United States senator Gaylord Nelson in 1970, Earth Day's reach has spread around the world and is now marked in about 175 countries.

Earth Day Network, the organizers of Earth Day, are launching the "Green Generation" campaign.

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The campaign will last two years and Earth Day's organizers hope it will raise awareness on how to reverse dangerous environmental trends.

As the day unfolds, CNN brings you the best pictures from around the globe.

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