Urban areas are considered the home of prosperity and development, but also large consumers of resources, which generate pollution, unsustainable growth, and social inequality. In this sense, urban areas are responsible for 75% of the planet's resource and energy consumption and 80% of global CO₂ emissions. This situation will be aggravated in the future if we consider that currently around 50% of all inhabitants live in cities, and it is estimated that this number will reach 80% in 2050, although this future increase in urban population might be partially affected by pandemics.

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城市系统中的循环经济：如何衡量影响？

城市地区被视为繁荣与发展的家园，但也被视为大量的资源消耗者，这些资源产生了污染，不可持续的增长以及社会不平等。从这个意义上讲，城市地区占地球资源和能源消耗的75％，占全球CO ₂排放的80％。如果我们考虑到目前约有50％的居民居住在城市，这种情况将在未来加剧，尽管到2050年，这个城市人口的增长可能部分受到大流行的影响，但估计这一数字将在2050年达到80％。 。