The New York City apartment building where I grew up was built in the early 1960s. The building’s heating system still has only one thermostat for more than 150 apartments, and that thermostat is usually set in the mid-70s. If it’s too hot, you must manually adjust each radiator in the apartment (and there’s one for each room). Most people simply open a window or two instead, which is not a very climate-smart solution. More at National Geographic’s NewsWatch blog, http://on.natgeo.com/10sNPuz.