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New York's Central Park and Chicago/Cook County's Forest Preserve District were early attempts to maintain convenient access to Nature for urban dwellers.
More recently, Singapore seems to be leading the way in enviro-conscious city planning and architecture. They're striving to be a "City in Nature," and have about half their area in green space. https://www.archdaily.com/976437/how...an-environment
As a tiny city-state with a population over 5,000,000, Singapore has to incorporate nature into its urban environment or there would be very little space where nature could thrive. It has a tropical rainforest climate making it easy to incorporate lush greenery into urban design.
In the US, we have so much rural and suburban space for green environments, national forests and wilderness areas, thus far less incentive to convert urban areas into green spaces. Portland (OR) has an ecoroof (rooftop garden) movement, with new buildings over a certain size required to install them, and city buildings adding them.