hot stain
n.— «Because there are what scientists call “hot stains’”…the parts of the Earth now running out of potable water. Hot stains include northern China, large areas of Asia and Africa, the Middle East, Australia, the U.S. Midwest and sections of South America and Mexico.» —“Protecting water vital to America” by Marylou Healy APP.com (Asbury Park, New Jersey) June 16, 2008. (source: Double-Tongued Dictionary)