Geologists have mapped 6,000 miles of large rock formations in the United States that could be used to store some of the excess carbon dioxide building up in Earth's atmosphere. The carbon dioxide released by fossil fuel burning has been continually accumulating in the atmosphere since the start of the Industrial Revolution. ... Scientists and engineers have proposed several ways to artificially trap and store some of this excess carbon dioxide in underground aquifers and other large rock formations. Now scientists at Columbia University's Earth Institute and the U.S. Geological Survey have surveyed the United States and found 6,000 square...