Dr. VIRGINIA BURKETT (Chief, Forest Ecology Branch, National Wetlands Research Center, U.S. Geological Survey): For example, where we have artificial fill, the subsidence rates are much more rapid than they are on the natural levee deposits.

NPR: Satellite Imagery Shows a Sinking New Orleans

Nan Madol comprises a set of almost 100 stone and coral fill platforms or artificial islets separated by narrow channels and enclosed by an outer sea wall.

UNESCO: OFFICE IN APIA

All 12 of the 31 NFL stadiums with artificial turf now use in-fill systems.

FORBES: Magazine Article

Its potential for sports fields was realized early on, but AstroTurf so dominated the artificial turf market that it wasn't until 2002 that the first in-fill field was installed in the NFL, at Seattle's Seahawks Stadium (now called Qwest Field).

FORBES: Field of Screens

Its potential for sports fields was realized early on, but AstroTurf so dominated the artificial turf market that it wasn't until 2002 that the first in-fill field was installed in the NFL, at Seattle's Seahawks Stadium (now called Qwest (nyse: Q - news - people ) Field).

FORBES: Field of Screens