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Concrete and steel make up the bulk of today's skyscrapers and city buildings. But both materials require huge amounts of energy to process, accounting for nearly 10 percent of global carbon emissions. University of Cambridge...

In comparison with a car or truck, a scooter is a pretty green ride. They are lightweight, use less fuel, and are far easier to park. Yet, no matter how environmentally friendly they may seem, there is always room for improvement....