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註釋More than half the world's population lives in urban areas with the growth of super-cities of tens of millions of inhabitants, and although cities only encompass two per cent of the world's land surface, they are responsible for consuming over 75 per cent of the planet's resources and produce 75 per cent of the world's waste. In the UK, over 80 per cent of the population already lives in urban areas, and the country is going through a new phase of urban expansion and regeneration that will affect the way we live for decades to come. This study, the Commission's 26th report, focuses on the environmental impacts of towns and cities, and considers the relationship between the urban environment and human health and wellbeing. The report finds that although there are many opportunities and attractions in urban living, there are also many environmental problems including contributing to greenhouse gas emissions, excess water consumption, traffic congestion and poor housing conditions. The report highlights the need for an over-arching urban environment policy to deliver environmental sustainability by co-ordinating the provision of key services and to create the institutional and social environment which encourages the uptake of existing technology to improve urban environmental performance. It calls for a new 'environmental contract' be established to forge partnerships between local and central government and the private and voluntary sectors, with high-level urban environmental targets that government regards as essential, while devolving to local authorities the responsibility for defining and prioritising action on environmental problems of local concern.