After 46 years, people around the world are still honoring Earth Day with a different theme every year. This year's theme is Trees for the Earth. Earth Day Network is calling people to action by encouraging them to plant trees through organized events around the world.
Instagram users around the world celebrated Earth Day with National Geographic by sharing their best pictures illustrating the mysteries and magic of our planet.
Using the tag #NatGeoEarthDay, we selected our favorite photos from these submissions.
Click here to see photos and read more about this year's Earth Day.