Urban green space is thought to contribute to citizen happiness by promoting physical and mental health. Nevertheless, how urban green space and happiness are related across many countries with different socioeconomic conditions has not been explored. By measuring the urban green space score (UGS) from high-resolution satellite imagery of 90 global cities covering 179,168 km² and 230 million people in 60 developed countries, we find that the amount of urban green space and GDP are correlated with a nation’s happiness level. More specifically, urban green space and GDP are each individually associated with happiness. Yet, only urban green space is related to happiness in the 30 wealthiest countries, whereas GDP alone can explain happiness in the subsequent 30 countries in terms of wealth. We further show that the relationship between urban green space and happiness is mediated by social support and that GDP moderates this relationship. These findings corroborate the importance of maintaining urban green space as a place for social cohesion to support people’s happiness.

城市绿地被认为可以通过促进身心健康来促进公民幸福。然而，在许多具有不同社会经济条件的国家，城市绿地和幸福感之间的关系尚未得到探索。^{通过测量覆盖 179,168 公里2}的全球 90 个城市的高分辨率卫星图像的城市绿地得分 (UGS)对 60 个发达国家的 2.3 亿人口，我们发现城市绿地数量和 GDP 与一个国家的幸福水平相关。更具体地说，城市绿地和 GDP 分别与幸福感相关。然而，只有城市绿地与 30 个最富裕国家的幸福感相关，而仅 GDP 就可以解释随后 30 个国家的幸福感。我们进一步表明，城市绿地与幸福感之间的关系是由社会支持调节的，而 GDP 调节了这种关系。这些发现证实了维护城市绿地作为社会凝聚力以支持人们幸福的场所的重要性。