An experiment that showed that by spending ~2% of its GDP on energy efficiency, New York City could lower its emissions by almost 35%. — What is the problem with big buildings? Big buildings, unsurprisingly, use a lot of resources to accommodate the large number of people that live or work inside. They use a lot of electricity, gas, water, space, and whatnot. The problem is, that with the usage of that magnitude it also becomes easy to waste. …