"This breakthrough enables scientists to do something that was impossible until now," according to the system's creators.

A hiker and outdoorsman, Mr. Thomas as a child yearned for a world where nature ruled supreme. His map represents the “idealistic planet that I wanted,” Mr. Thomas, 34, said.

Energy & Environment New map depicts the world’s hidden reserves of groundwater in unprecedented detail by Saul Elbein - 07/17/24 11:49 AM ET ...