绿色城市是指在设计时考虑到社会、经济、环境影响（通常称为三重底线）和现有人口的弹性栖息地，同时不损害子孙后代的能力的城市。经历相同。联合国可持续发展目标11将可持续城市定义为致力于实现绿色可持续性、社会可持续性和经济可持续性的城市。他们致力于通过注重包容性的设计为所有人提供机会并保持可持续的经济增长来实现这一目标。重点还包括最大限度地减少所需的能源、水和食品投入，并大幅减少废物、热量输出、空气污染（CO 2、甲烷和水污染）。视觉艺术家理查德·瑞斯特 (Richard Register)在其 1987 年出版的《生态城市伯克利：为健康未来建设城市》一书中首次创造了“生态城市”一词，书中他提供了适用于任何地方的创新城市规划解决方案。其他设想可持续城市的领军人物包括建筑师Paul F Downton（后来创立了 Ecopolis Pty Ltd 公司），以及作家Timothy Beatley和Steffen Lehmann（他们在该主题上撰写了大量文章）。有时会使用 工业生态学领域来规划这些城市。

联合国环境规划署指出，当今大多数城市都面临着环境退化、交通拥堵、城市基础设施不足以及缺乏供水、卫生和废物管理等基本服务的问题。可持续城市应促进经济增长并满足居民的基本需求，同时为所有人创造可持续的生活条件。理想情况下，可持续城市是在生态、经济、政治和文化四个领域创造持久生活方式的城市。欧洲投资银行正在协助城市制定可再生交通、能源效率、可持续住房、教育和医疗保健等领域的长期战略。过去八年，欧洲投资银行已花费超过 1500 亿欧元用于改善城市。

城市仅占地球土地的 3%，却消耗了 60% 至 80% 的能源，并排放了至少 70% 的碳。因此，创建安全、有韧性和可持续的城市是可持续发展目标的首要任务之一。阿德莱德市议会指出，社会可持续发展的城市应该是公平的、多样化的、互联的、民主的，并提供良好的生活质量。可持续城市的优先事项包括能够可持续地依赖周围的自然环境来养活自己，并能够利用可再生能源为自己提供动力，同时创造最小的生态足迹和最低的污染量。所有这一切都将通过有效的土地利用、有机物堆肥、回收使用过的材料和/或将废物转化为能源来实现。我们的想法是，这些贡献将减少城市对气候变化的影响。

如今，全球 55% 的人口居住在城市地区，联合国预计到 2050 年，这一数字将上升至 70%。到 2050 年，可能会有近 25 亿人生活在城市中，这可能会使创建更可持续的社区变得更加困难。这些大型社区为具有环保意识的开发商提供了挑战和机遇。进一步定义和努力实现可持续城市的目标具有明显的优势。人类在促进社会联系的城市空间中蓬勃发展。城市研究理论家理查德·佛罗里达（Richard Florida）专注于可持续城市的社会影响，并指出城市需要的不仅仅是有竞争力的商业环境；他们应该营造良好的人文氛围，吸引各种类型的个人和家庭。正因为如此，向更加密集的城市生活的转变将为社会互动和人类繁荣的条件提供一个出路。这些类型的城市地区还将促进公共交通、步行和自行车的使用，这将有利于公民的健康和环境。

Green cities are cities designed with social, economic, environmental impacts (often referred to as the triple bottom line) and resilient habitats of existing populations in mind, while not compromising the capabilities of future generations. Same experience. The United Nations Sustainable Development Goal 11 defines a sustainable city as a city that is committed to achieving green, social and economic sustainability. They are committed to achieving this goal by focusing on inclusive design to provide opportunity for all and maintain sustainable economic growth. Priorities also include minimising the energy, water and food inputs required, and significantly reducing waste, heat output, air pollution (CO2, methane and water pollution). Visual artist Richard Register first coined the term "eco-city" in his 1987 book, "Eco-City Berkeley: Building Cities for a Healthy Future," in which he offers innovative urban planning solutions that can be applied anywhere. Other leading figures in imagining sustainable cities include architect Paul F Downton (who later founded Ecopolis Pty Ltd), and writers Timothy Beatley and Steffen Lehmann (who have written extensively on the subject). The field of industrial ecology is sometimes used to plan these cities.

According to UNEP, most cities today face environmental degradation, traffic congestion, inadequate urban infrastructure and a lack of basic services such as water supply, sanitation and waste management. Sustainable cities should promote economic growth and meet the basic needs of residents, while creating sustainable living conditions for all. Ideally, a sustainable city is one that creates a lasting way of life in four areas: ecological, economic, political and cultural. The EIB is assisting cities in developing long-term strategies in areas such as renewable transport, energy efficiency, sustainable housing, education and healthcare. Over the past eight years, the European Investment Bank has spent more than €150 billion on improving cities.

Cities occupy only 3 percent of the Earth's land, but they consume 60 to 80 percent of its energy and emit at least 70 percent of its carbon. Creating safe, resilient and sustainable cities is therefore one of the top priorities of the Sustainable Development Goals. Adelaide City Council states that a socially sustainable city should be equitable, diverse, connected, democratic and provide a good quality of life. Priorities for sustainable cities include being able to sustainably rely on the surrounding natural environment to feed themselves and being able to power themselves with renewable energy sources while creating the smallest ecological footprint and the lowest amount of pollution. All of this will be achieved through efficient land use, composting of organic matter, recycling used materials and/or converting waste into energy. The idea is that these contributions will reduce the city's impact on climate change.

Today, 55 percent of the world's population lives in urban areas, and the United Nations expects that figure to rise to 70 percent by 2050. By 2050, nearly 2.5 billion people could be living in cities, which could make it harder to create more sustainable communities. These large communities present both challenges and opportunities for environmentally conscious developers. There are clear advantages to further defining and working towards the goal of a sustainable city. Humanity thrives in urban Spaces that foster social connections. Urban studies theorist Richard Florida focuses on the social impact of sustainable cities, noting that cities need more than a competitive business environment; They should create a good cultural atmosphere that attracts all types of individuals and families. Because of this, the shift to more dense urban living will offer a way out for social interaction and conditions for human flourishing. These types of urban areas will also promote the use of public transport, walking and cycling, which will benefit citizens' health and the environment.