Earth Day is a time for humanity to reflect on its impact on our planet, and for individuals to get out and do something positive to help keep the Earth clean and the environment a safe habitat. Earth Day also means graphic designers are busy working to design posters, flyers, postcards, ads and other marketing materials to help promote Earth Day cleanup efforts. Assisting in litter clean up and other Earth Day efforts isn’t so much volunteerism as it is duty; or at least an investment in the future. If you’re a graphic designer charged with developing Earth Day marketing materials, you can find inspiration in the following 30 Earth Day-inspired designs.