Scientists analyzed time-use surveys from more than 140 countries, covering about 87% of the world’s population, to build an “average global human day”. They found that roughly 9 of our 24 hours are spent asleep and another 9 caring for our own minds and bodies or those of others, activities such as eating, socialising, learning, media use, hygiene and health care. The remaining 6 hours go to tasks that keep society running: growing and preparing food, travelling, trading, governing, building and maintaining our surroundings.
About 5 minutes per day are devoted to activities that directly alter the environment, such as extracting energy, manufacturing materials or managing waste. Because the time needed for planet-shaping work is already so small, the authors argue that redirecting even a few of those minutes toward cleaner energy and better waste management could make a significant difference for climate and biodiversity.
They also note pronounced income-related gaps: people in low-income countries spend far longer growing food, while time spent commuting, eating, grooming and housework is surprisingly similar everywhere. Overall, the study offers a new, big-picture baseline for thinking about how humanity might rebalance its daily efforts toward a more sustainable future.
The global human day – William Fajzel et al., Proceedings of the National Academy of Sciences, vol. 120 (25), e2219564120, published 20 June 2023.
Researchers combined labour statistics and national time-use surveys from 2000-2019 to allocate every global human hour into 24 activity categories within three broad groups: altering the external world, attending to human minds/bodies and organizing society. Key findings include nine hours of sleep, 9.1 hours on human-centred tasks, 2.6 hours that drive the entire formal economy and just minutes dedicated to energy, materials and waste. The authors suggest that repurposing some of those minutes toward green transitions is both feasible and urgent.
Scientific American: “See how humans around the world spend the 24 hours in a day” – Clara Moskowitz & Studio Terp, 1 November 2023.
Popular-science article that visualises the PNAS dataset, highlighting that more than one-third of global time is spent in bed and emphasizing the opportunity to shift a few minutes toward climate-positive tasks.
McGill University press release: “The global human day – A bird’s eye perspective” – 15 June 2023
Summarizes the research, stressing that economic activity occupies only about one-tenth of the global day and that food production time shrinks dramatically as national income rises.


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