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Even so, there is a limit to how much voluntary action can achieve, says James Speth, dean of Yale's School of Forestry and Environmental Studies.
ECONOMIST: Companies as activists
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"Eventually we drilled into the space above the stairs, " says Speth.
CNN: Vietnam War bunker reopened under luxury hotel
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It took a full week of pumping before the water level was brought down to 20 centimeters, and Speth, wearing boots, shorts and an old T-shirt, could splash down to explore.
CNN: Vietnam War bunker reopened under luxury hotel
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Expect the supercar to be just one of several to use advanced electric drivetrains, though Speth cautioned that neither Jaguar nor Land Rover are ready to commit to a pure battery-electric vehicle.
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In August 2011, Speth and his chief engineer finally broke through more than two meters of earth and reinforced concrete and the shelter's 278-millimeter-thick ceiling to emerge into a 40-square-meter space, divided into five interconnecting rooms by heavy metals doors.
CNN: Vietnam War bunker reopened under luxury hotel