The article looks at urban sprawl in cities across 29 countries. They used data on land cover, population, and city boundaries to measure sprawl. The study found that many cities have been spreading out since 1990, but in different ways. Urban areas in countries like Austria, Canada, Slovenia, and the United States show high levels of sprawl, while cities in countries like Czech Republic, Denmark, France, Hungary, Poland, and Slovak Republic have also been sprawling since 1990. Key aspects of sprawl, like fragmented urban land, varying population density, and low-density land use, have increased in most countries over time.