http://www.thinkgeek.com/blog/2018/04/happy-earth-day.html

To the best of our knowledge, every person we’ve ever met was born on planet Earth. That makes it pretty rad! So on April 22nd, aka Earth Day, we celebrate this beautiful planet we all call our home. Earth Day is a day to both honor the planet we have now and to take a moment to think about how we can best protect our home planet for us and future generations.