In ancient India, over 2,003 years ago, as annual public works projects, kings and emperors planted trees along the roads to provide shade for weary travelers.
Today, people all over the world are working hard to keep our planet green. Earth Day (sometimes called Earth Week) is a time put aside each year to remind us all how important it is to accomplish this goal. These sites explain why it's so important to keep our planet green, and what we can do to help.
Have fun learning about Earth Day!