The International Mother Earth Day is observed April 22 and the world is already setting agendas to increase awareness about Earth's natural environment, and to make sure that we provide clean water and pollution free air to breathe for the future generations.

Year 2012 will see the 42nd Anniversary of Earth Day. Reportedly, the first person to come up with the whole concept of Earth Day was John McConnell in the year 1969 at a UNESCO Conference in San Francisco and that was the first city to have ever celebrated Earth Day. But in the same year, a separate Earth Day was founded by United States Senator Gaylord Nelson and it was first held April 22, 1970.

The Earth Day went international in 1990 and since then, efforts are being taken worldwide to focus on environmental issues for a week around April 22.

So what is planned by the National Aeronautics and Space Administration (NASA), the US government's agency responsible the nation's civilian space program and for aeronautics and aerospace research?

According to their website, NASA will is taking part in the Earth Day celebration on the National Mall in Washington through the weekend from April 20 to 22. During these three days, the agency will be involved in activities and exhibitions open to the public.

Also, there are other activities scheduled at nearby NASA Goddard Space Flight Center in Greenbelt, Md. These activities include exhibitions that would highlight the NASA science and technology to advance knowledge and awareness of the planet Earth.

The Green Theater will feature satellite images and presentations by NASA scientists and others.

Below is the schedule of NASA Earth Day events on the Mall given out by their official Web Site:

Saturday, April 21

12 - 5 p.m. EDT -- NASA Village open to the public. Demos and exhibitions in all three tents.

1 - 2 p.m. EDT -- NASA UStream broadcast in the Green Theater: featuring scientists talking about how NASA helps us see and understand Earth in new ways.

Sunday, April 22

12 - 7 p.m. EDT -- Official Earth Day activities

11 a.m. - 5 p.m. EDT -- NASA Village open to the public

NASA will also be hosting the following Earth Day activities at the Goddard Space Flight Center Visitor Center:

Wednesday, April 18

12 - 1 p.m. EDT -- The Next Generation Blue Marble from Suomi NPP, Robert Simmon, NASA Earth Observatory

1 - 2 p.m. EDT -- Digital Learning Network presentation: Beautiful Earth Multimedia Performance and Science Dialogue. Kenji Williams, Jim Rock and Thorsten Markus present a multimedia and musical online performance: http://www.dln.nasa.gov 

Below are a few images from the NASA's image gallery. NASA has compiled and released stunning satellite images of the Earth.