Text 1: Many urban planners advocate for 'mixed-use' zoning, which combines residential, commercial, and industrial spaces in a single neighborhood. Proponents argue that this model reduces dependence on automobiles, as residents can walk to work and shops, thereby decreasing carbon emissions and fostering local community. Text 2: The purported environmental benefits of mixed-use zoning are often negated by the 'last-mile' logistics problem. While residents may walk more, the high density of commercial businesses in residential areas leads to a significant increase in heavy delivery vehicle traffic. These vehicles, which often idle in narrow streets, can produce more localized pollution than the passenger cars they were intended to replace.