New York City mayor DiBlasio has argued that steel and glass buildings ought to be banned due to perceived energy inefficiency. Lost in his argument, really, is the fact that despite the fact that even "Thermopane"/"low-E" glass has abysmal insulation value, big buildings like the World Trade Center and the Sears Tower do not have boilers for heating because lighting, people, and the like heat them. They run air conditioners year-round, and hence those big glass windows are actually a feature, not a bug--they allow heat to dissipate.
Plus, the masonry that characterizes Gotham's iconic brownstones and other historic architecture has about the same "R" value--about 2.4/12" thick--as thermopane windows. So DiBlasio's proposal would, if implemented, have about the same effect as it would if all of New York City's residents decided to live like the mayor--driving a big SUV to work each day, living in a big mansion, and the like.