While the Obama administration says it needs more time to assess the potential risks surrounding the proposed Keystone XL pipeline, a vast underground network of more than 2 million miles of energy pipeline already traverses the United States.

Several energy experts who represent the oil and gas industry say the controversial Keystone XL, a 1,700-mile pipeline that would run from Canada to Texas, poses less of a risk to the environment than the estimated 50,000 miles of crude oil pipelines already crisscrossing the U.S., a network they say is safe and efficient.