因應氣候變遷與人口快速成長，美國紐約市已提出「綠色城市」的願景與具體行動計畫──「規劃紐約：更綠更偉大」（PlaNYC: A Greener, Greater New York）。422地球日當天，紐約市長彭博（Michael Bloomberg）在一場政策演說中特別提到，這項涵蓋127項行動方案的PlaNYC計畫已在2006年12月啟動，目標是在2030年以前，讓這座全美最大城市蛻變為美國最「綠色」的城市。
New York Mayor Michael Bloomberg Sunday presented a plan to cope with climate change and a fast-growing population in a sweeping policy speech containing 127 initiatives. PlaNYC: A Greener, Greater New York, has been in the works since December but the mayor issued it on Earth Day to underline his goal of making America's largest city also the greenest by 2030.
Covering land, air, water, energy, and transportation, PlaNYC is the result of thousands of hours of work, informed by public meetings and feedback from New Yorkers. It establishes goals that include reducing greenhouse gas emissions by 30 percent by 2030, although the mayor says even that goal is not set high enough.
To start planning for the sea-level rise that melting glaciers and ice sheets are expected to bring, the mayor of this low-lying city proposes to create an interagency task force. The new body would "protect our city's vital infrastructure and expand our adaptation strategies beyond the protection of our water supply, sewer, and wastewater treatment systems to include all essential city infrastructure," the mayor said.
The plan calls for a citywide strategic planning process for climate change adaptation. The mayor would work with costal neighborhoods to develop site-specific protection strategies by creating a community planning process.
The city would document all floodplain management strategies to secure discounted flood insurance for New Yorkers, and create a strategic planning process for climate change adaptation that will ensure that New York's Federal Emergency Management Administration 100-year floodplain maps are updated.
The city would also amend the building code to address the impacts of climate change.
The United Nations, with headquarters on New York City's East River, applauded the mayor's plan. "This is exactly the type of initiative that we would like more cities and communities to undertake," said UN Director of Sustainable Development JoAnne DiSano. "Real development has to allow for economic growth and social development in an environmentally balanced way. We are strongly encouraged by this proposal."