Today's skyscrapers, which are driven by engineering and design innovations, reflect expanding economies and desire for taller buildings, according to this article. The Council on Tall Buildings and Urban Habitat reports that almost 600 buildings with a height of at least 656 feet are being planned or are under construction around the globe. "At the moment, it looks like the trend will be for taller and taller buildings," said Matti Alahuhta of Kone Oyj, a manufacturer of escalators and elevators.

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