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'Acts of Green' urged as Earth Day is celebrated around the world

By Matthew Knight, CNN
April 22, 2012 -- Updated 1608 GMT (0008 HKT)
Environmental activists parade through the streets of Malang, Indonesia to mark the 42nd anniversary of Earth Day. Environmental activists parade through the streets of Malang, Indonesia to mark the 42nd anniversary of Earth Day.
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Earth Day 2012: Indonesian rally
Wildlife conservation
Kolkata, India
Canal-top solar power, India
Planting pines in Honduras
Green For All raise awareness in Atlanta, Georgia
Planting trees
Marking Earth Day in Morocco
Google doodle
Recycling waste
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STORY HIGHLIGHTS
  • Over a billion people around the world expected to participate in events to mark Earth Day
  • Conservation efforts, environmental rallies and educational programs unite under the banner
  • This year, organizers are trying to create "A Billion Acts of Green"
  • First Earth Day was conceived by U.S. senator Gaylord Nelson and took place on April 22 1970

(CNN) -- Events to mark Earth Day have been taking place around the globe on Sunday as people join together to celebrate and promote environmental causes.

From conservation efforts in El Savador to parades by activists in Indonesia, this year's event is as colorful and diverse as ever uniting over a billion people in 192 countries, according to organizers, Earth Day Network.

Earth Day is focusing efforts on creating "A Billion Acts of Green" in 2012.

Stunning images of Earth from space

Billed as "the world's largest environmental service campaign," organizers hope the effort will demonstrate widespread support for coordinated action to tackle environmental issues.

We're coming together on the Mall and standing in solidarity with millions of people at thousands of Earth Day events around the world
Kathleen Rogers, Earth Day Network

Pledges large and small have been flooding into the official Earth Day web site since its launch in November 2010 and a rally at the National Mall in Washington D.C. on Sunday will coordinate a final push to break through the one billion barrier.

The environment has been "put on the backburner by world leaders," according to Kathleen Rogers, president of Earth Day Network.

"That's why we're coming together on the Mall and standing in solidarity with millions of people at thousands of Earth Day events around the world," Rogers said in a statement on the Earth Day web site.

Earth Day by numbers

Earth Day was conceived by U.S. senator Gaylord Nelson in 1970 after he witnessed a massive oil spill off the coast of Santa Barbara, California the previous year.

The inaugural event attracted the support of 20 million Americans but has grown rapidly in recent decades.

In 1990, Earth Day saw 200 million people participate in 141 countries, according to organizers and by the turn of the century over 5,000 environmental groups worldwide were involved.

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