A conservationist is someone who works to protect nature and natural resources from being damaged or used up. Conservationists might work to save endangered animals, preserve forests, protect clean water sources, or keep wilderness areas from being destroyed. They believe we should use nature's resources wisely so they'll still be around for future generations.

President Theodore Roosevelt was one of America's most famous conservationists. He helped greatly expand the National Park System to preserve places like Yellowstone and the Grand Canyon, ensuring these natural wonders would remain protected. He understood that once a forest is cut down or a species goes extinct, you can't get it back.

A conservationist is different from a preservationist, who wants to leave nature completely untouched. Conservationists believe in sustainable use, meaning we can enjoy and use natural resources like forests and fisheries as long as we manage them carefully. A conservationist might support responsible fishing that leaves enough fish to reproduce, while opposing overfishing that could wipe out an entire species.

Modern conservationists work in many ways: some study wildlife populations, others create protected habitats, and some teach people why conservation matters. Turning off lights to save energy or avoiding littering in a park are examples of thinking like a conservationist.