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The contribution of water supply systems to climate change

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Every two seconds, one person joins the expanding numbers of the world urban population, which is expected to exceed the rural population by 2008. In New Zealand, over 85% of the population now lives in urban areas and the population of the Auckland region is expected to double by 2030 (Ministry for Environment 2003). However, the rate of increase in household numbers is greater than population numbers (Auckland Regional Council 2003). The typical suburban house plot or section, which used to be around 1,000 m2, has fallen in size over the last 20 years, especially in city locations. Nonetheless, the stand-alone house with three bedrooms is still the most common house type. Current trends in household sizes, however, indicate an increase in the size of future stand-alone housing to four bedrooms or more. Of the current housing stock in New Zealand, 55% has been built since 1970—with a 25% increase in the floor area of an individual house over this time (DTZ New Zealand 2004). An increasing proportion of new constructions, especially in inner-city locations, are nonetheless for dwellings in multi-unit blocks and apartments, signalling a trend towards higher-density urban housing. There are suggestions that the number of multi-unit dwellings could exceed that of stand-alone dwellings by 2016 (Beacon Pathways Limited 2006).
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Keywords: change; climate; contribution; supply; systems; water

Document Type: Research Article

Publication date: October 13, 2009

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