Time capsules can cover a calendar year like 2014, or capture a special day like Earth Day. In 2015, Earth Day 45 will take place on Wednesday, April 22. From now until then, you can collect items to create an Earth Day time capsule, with the Howtosmile.org activity Create Your Own Time Capsule. Gather items like photos of endangered species—will they still be endangered when you open your time capsule?
Include a piece of something that can't be recycled—will there be a recyclable version in years to come? Save an article about the environment—will it still be true in a year or even five years from now? You can also add things like postage stamps with Earth themes, and photos of yourself helping clean up the environment. Talk about what you're including with your family, friends and classmates. Then seal your capsule and mark it to be opened on a future Earth Day, maybe Earth Day 50 in 2020!