News - Scientists calculate average ‘global human day’

Every human on Earth has the same 24 hours to spend in a day—but the way we divide those hours for work and sleep and school and play varies a lot, reports Scientific American. Scientists recently compiled the available data about how people around the world allocate their time and used them to define the average “global human day.” More than a third of our hours are spent in bed, they found, with the rest split among three categories the researchers devised based on whether the time directly affected humans, the physical world, or where and what people are doing. Activities such as agriculture took up much more time in poorer countries than in wealthier ones, whereas others such as human transportation were fairly constant everywhere. Ultimately the study found that relatively little time—about five minutes per average human day—goes to activities that directly alter the environment and climate change, such as extracting energy and dealing with waste, suggesting an opportunity to put in more time to help the planet. “We have to switch off fossil-fuel energy and construct more renewables,” says study co-author Eric Galbraith of McGill University.