Sustainability
Even in the Middle East... Sustainability is the new politically correctness, so you build wind turbines on your World Trade Center. It's just that... well... they're sitting idle for most of the time. Seven out of twelve months, the average wind speed is just 7 knots and below 10 knots for all other months of the year.
To put this into perspective. 'Easy' barely notices 5 knots, feeling adrift. At 10 knots, things start to move...
(1 knot is roughly 0.5 m/s and 1.8 km/h)
There is a National Geographic documentary in the series Mega Structures about the construction of the World Trade Center.
Update November 15th: Of course it's illuminated at night...
