 This study reveals that wind stilling has been observed in many regions across the northern hemisphere, but the related mechanisms are not well understood. Analysis of wind speed variations in South Korea during 1993 to 2015 show that annual mean surface wind speeds at rural stations have increased by up to 0.41ms-1 decade-1, while those at urban stations have decreased by up to minus 0.63ms-1 decade-1. The local wind speed variations are found to be negatively correlated with population density, and dustiness analyses show that the increase in local surface roughness due to urbanization can explain the observed negative wind speed trends at urban stations. However, these trends are not found in regional climate model simulations in Cordexia as these models do not take into account the impact of urbanization on wind variations during the period. The study suggests that urbanization plays an important role in recent wind stilling in rapidly developing regions such as South Korea, and future climate projections in Cordexia may overestimate wind speeds in urban areas, requiring future regional climate projections to consider the effects of urbanization for a more accurate projection of wind speeds. This article was authored by Xing Chen, Su Zhong Zhong, Vun Yang Park, and others. We are article.tv, links in the description below.