Research from the National Renewable Energy Laboratory (NREL) has found that for highly glazed buildings, like the shimmering skyscrapers of big cities, photovoltaic (PV) windows make a sizable difference in the building’s carbon footprint, reducing energy use and CO2 emissions by as much as 40%. The study, published in the journal One Earth, outlines how PV windows can be an important component for designing highly glazed buildings that reach net-zero targets. According to the study, about one-third of global energy consumption comes from buildings, showing the need to reduce energy demand and related emissions. But despite the known downsides of highly glazed buildings, like poor energy performance and thermal efficiency, they are still a popular choice in the industry.