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Think of clean tech as investment with ROI

Solar Impulse pilot Bertrand Piccard renews pitch for sustainable energy.

MR PICCARD: 'In a city like Singapore, billions of dollars are lost in cooling systems... If you insulate a building today, the energy you save has a payback time of two to three years, then it's full profits.'

IN 2009, Bertrand Piccard, who finished the first non-stop balloon flight around the world back in 1999, gave a Ted Talk where he compared life to a ride in a balloon. In a balloon, he said, you often want to go in a direction, "but the winds push us in another direction, like in life. And as...

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