Earth Day, event first observed internationally on April 22, 1970, to help the need for the conservation of the world's natural resources. Starting as a pupil-led campus movement, initially observed on March 21, Earth Day has become a worldwide educational and media event. Environmentalists use it as a time to sum up current environmental problems of the planet: the pollution of air, water, and soils; the destruction of habitats; the fall of hundreds of thousands of plant and animal species; and the depletion of nonrenewable resources. The emphasis is on solutions that will weaken and possibly reverse the non-positive effects of human activities. Such answers include recycling of manufactured goods, fuel and energy conservation, stopping the use of harmful chemicals, banning the destruction of large habitats such as rain forests, and protecting endangered species.