This year's theme is The Face of Climate Change, chosen to highlight the "mounting impact" of global warming on people worldwide, according to the Earth Day Network, the group founded by the first Earth Day organizers.

The Earth Day Network is asking people to become their own "climate reporters" by sending their pictures and stories of people, animals, and places threatened or affected by global warming, according to the group's website. (See a map of global warming effects.)

On or near Earth Day, an interactive display of the images will be shown at events around the world, including next to federal buildings in countries that produce the most carbon pollution.

"The Face of Climate Change will not only personalize and