The human body is 70% water. The surface of the earth is 70% water. It is THE most important substance for making life possible. Learn about insightful ideas for using water, keeping it clean and getting it where people need it.
Arbuscular mycorrhizal fungi live in symbiosis with plant roots and are able to store up to 70 percent of organic carbon from leaf litter. (Mark Perkins/Flickr)