How can you safely evacuate an entire skyscraper in an emergency? Mecca Rushmer speaks to the engineers about the urgent challenge facing them post-9/11. Increasingly frequent terrorist attacks and natural disasters have put the design of high-rise buildings around the world under heavy scrutiny. Architects and engineers must develop the strongest materials, the tightest security measures and the highest energy efficiency before a tower is even considered to adorn a skyline. These aspects are referred to as "future-proofing a building".
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