Part of complete coverage on
'Acts of Green' urged as Earth Day is celebrated around the world
updated 12:08 PM EDT, Sun April 22, 2012
Environmental activists parade through the streets of Malang, Indonesia to mark the 42nd anniversary of Earth Day.
Earth Day 2012: Indonesian rally
Canal-top solar power, India
Planting pines in Honduras
Green For All raise awareness in Atlanta, Georgia
Marking Earth Day in Morocco
- 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.
Part of complete coverage on
updated 10:44 AM EDT, Wed March 27, 2013
Philippe Cousteau recalls his grandfather's advice and asks how you'd like to look at the ocean in 10 years' time -- with regret or awe.
updated 11:07 AM EDT, Wed March 27, 2013
We need to rebuild the ocean's abundance, variety and vitality. Without such action, our own future is bleak, say marine scientists.
updated 6:27 AM EDT, Fri March 22, 2013
Getting water to every person on the planet can and should be done by 2030, argues WaterAid's Chief Executive Barbara Frost.
updated 11:50 AM EDT, Wed March 20, 2013
Oceans cover more than two-thirds of our planet producing half of the oxygen we breathe and helping regulate our climate.
updated 6:57 AM EST, Fri March 8, 2013
Global warming has propelled Earth's climate from one of its coldest decades since the last ice age to one of its hottest -- in just one century.
updated 9:40 AM EDT, Tue March 12, 2013
We need to innovate alternative energies now more than ever says Professor Steven Cowley. Fusion could provide the answer, he argues.
updated 1:23 PM EST, Fri November 30, 2012
New research is showing that a large majority of tree species around the world are operating on the brink of collapse.
updated 11:17 AM EST, Mon November 26, 2012
On December 11, 1997, nations signed the Kyoto Protocol in a bid to tackle climate change. Now it's about to expire with a whimper.
updated 11:55 AM EST, Tue November 20, 2012
The level of greenhouse gases in the atmosphere reached record highs in 2011, according to new data published by the U.N.
updated 6:39 AM EST, Mon November 19, 2012
Photographer James Balog's remarkable images were captured on time-lapse cameras at glacier sites dotted around the world.
updated 10:33 AM EDT, Tue July 17, 2012
There are plans to pump oxygen into Baltic Sea in a bid to revive an area so polluted it can barely sustain life.
updated 7:20 PM EDT, Sat July 7, 2012
Caterpillar fungus -- or Himalayan Viagra -- is prized in traditional medicine. But over harvesting could be damaging grasslands in Nepal.
updated 4:07 AM EDT, Tue July 17, 2012
Dressed in a wet suit, air tanks on his back is an image of Jacques Cousteau most people would recognize. But he was also an inventive genius.
updated 9:04 AM EDT, Fri July 13, 2012
Despite their green credentials, electric cars still come up short against their petrol-powered cousins on range. The QBEAK could change all that.
updated 12:00 PM EDT, Wed June 20, 2012
An ambitious regeneration scheme is revitalizing Atlanta, transforming a disused railway line into a green community space.
updated 10:03 AM EDT, Tue May 22, 2012
A marine expedition of environmentalists has confirmed the bad news it feared -- the "Great Pacific Garbage Patch" extends even further than previously known.