A movement that begun 39 years ago, Earth Day is again commemorated today to promote awareness and remind us to appreciate this place we live in called Earth. It aims to forward campaigns and movements toward preserving what we have left in the environment.
This year, the Earth Day Network also starts The Green Revolution campaign. It is a two-year campaign that proceed until the 40th Anniversary of Earth Day in 2010. The Green Generation is about people, ordinary or otherwise, willing to make a stand for the global issues or even as simple as improving one's own natural environment. It is open to everyone, whatever age or nationality.
Its core principles are:
- A carbon-free future based on renewable energy that will end our common dependency on fossil fuels, including coal.
- An individual’s commitment to responsible, sustainable consumption.
- Creation of a new green economy that lifts people out of poverty by creating millions of quality green jobs and transforms the global education system into a green one.

Check the details of the activities here.
Even some private companies gave their share in supporting the environmental campaign through their own promotions like what Starbucks did .
Source: http://www.earthday.net/earthday2009