Scientists said certain geological conditions, such as sandstone deposits, can act as natural storage tanks for the gas. GEROLSTEIN, Germany: Nested in the forested foothills of western Germany’s Gerolsteiner Dolomiten nature reserve are rocks that are approximately 200 million years old. These rocks, formed over geological periods hundreds of millions of years ago, could be part of the solution to today’s climate problems. “These rocks are solid,” said Franz May, from the German Federal