WWF is an international conservation organization operating in over 100 countries for over 45 years. Their mission is to conserve nature, promote efficient resource and energy use, and ensure a future where humans live in harmony with nature. By 2020, WWF aims to conserve 19 of the world's most biologically diverse and threatened places and species. They encourage donations, adoption programs, sustainable travel, and participation in Earth Hour to symbolize working together towards a sustainable future.