Take this quiz to find out. The answers are at the bottom of the page. Arbor Day is an annual observance dedicated to the planting and conservation of trees. Redwood National Park, which covers 446 sq km along California's northwest coast, is one of the last remaining ancient redwood forests in the world.
Forests are an important defense against global warming.
In the U.S. and Canada, forests are threatened by extensive logging, called clear-cutting, which destroys plant and animal habitat and leaves the landscape bare. Most forest fires are a result of lightening instead of human carelessness or deliberate arson, as most people think.