Ever find a leaf and wonder about the tree it came from? Leafsnap is a series of electronic field guides being developed by researchers from Columbia University, the University of Maryland, and the Smithsonian Institution. The free mobile apps use visual recognition software to help identify tree species from photographs of their leaves. They contain beautiful high-resolution images of leaves, flowers, fruits, petioles, seeds and bark.
Explore maps and graphs of historical and projected climate trends in your local area. View data by topics to see how climate change will impact things you care about.
Earth Day Network's mission is to diversify, educate and activate the environmental movement worldwide. Growing out of the first Earth Day, Earth Day Network is the world's largest recruiter to the environmental movement, working with more than 50,000 partners in nearly 195 countries to build environmental democracy. More than 1 billion people now participate in Earth Day activities each year, making it the largest civic observance in the world.