“The Hole Thing” or “I Think I Canyon”

http://www.usatoday.com/news/nation/environment/2010-08-24-grand-canyon_N.htm?csp=hf

The National Parks Conservation Association reports that the Grand Canyon is in danger from air pollution and water contamination from tourism, traffic, and nearby mining. Despite federal funding and park entrée fees, they are always in the hole.

They even say they may have to shut down operations, which would then require billions of dollars and thousands of years to fill the canyon with dirt.