The next generation of skyscrapers is being designed with the climate in mind. Architects are mixing steel with engineered timber, covering facades with solar glass and using natural ventilation to cut energy use.
Several cities now require new towers to report their carbon footprint before construction starts, and some offer extra height in exchange for greener designs.
Critics say retrofitting existing buildings matters even more, since most of the towers that will stand in 2050 have already been built.
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