Urban greenery can play a significant role in absorbing atmospheric carbon dioxide. According to a Columbia University study, trees, shrubs, flowers, herbs, and grasses in the five boroughs of New York City collectively absorb over 40% of the city's total atmospheric carbon dioxide emissions on a typical summer afternoon.
Wei, Dandan, Andrew Reinmann, Luke D. Schifer, and Roisin Commane. High resolution modeling of vegetation reveals large summertime biogenic CO2 fluxes in New York City. Environmental Research Letters 17, 12 (2022). https://doi.org/10.1088/1748-9326/aca68f.