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Deep inside the world's longest tunnel

Road Trip 2011: By building the Gotthard Tunnel, the Swiss government hopes to cut heavy truck traffic across the Swiss Alps in half, while doubling the efficiency and capacity of cargo trains between Zurich and Munich. It's also one of the largest infrastructure projects in the country's history.

By Jun. 7, 2011

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Where coal and clean tech meet

Massachusetts firm GreatPoint Energy is one of few green-tech start-ups with "steel in the ground," testing a method for turning coal into cleaner-burning natural gas.

By Apr. 13, 2009