In a world without people, how fast would NYC fall apart? Here's the timeline.
Briefly

If New York City’s population suddenly vanished, nature would reclaim the urban space in an accelerated timeline. The power grid would fail within days, resulting in darkness and initial mold growth in buildings. Abandoned areas like subways would flood, creating new habitats for wildlife. By the end of the month, Central Park and other maintained areas would transform into wild landscapes, overtaken by abundant plant life and animals that thrive in deserted environments. This scenario outlines the decisive impact of human absence on an urban ecosystem.
Without humans to maintain it anymore, Central Park will transition from a well-kept urban green space into a wild, unruly environment in just 30 days.
The absence of regular power maintenance means that the power grid would fail within a few days, plunging the city into darkness and leading to rapid decay.
As subway flooding begins, new ecosystems would flourish within these deserted tunnels, indicating a natural reclaiming of urban space by wildlife.
Mold will thrive in the absence of climate control, illustrating how quickly buildings can deteriorate without human upkeep.
Read at Popular Science
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