Demand for Cleaner Gas

386462 18: A 42-inch green pipe is moved into position under an existing 26-inch pipe October 3, 2000 in Howell, Michigan, 60 miles north of Detroit. The pipeline will carry natural gas from Canada to the northeastern US The demand for cleaner natural gas, estimated to be growing at 1.8% a year, is requiring more energy infrastructure to be built. At present, the US has 270,000 miles of interstate gas pipelines in place. (Photo by Robert Nickelsberg/Liaison)