Cities are particularly vulnerable to climate change because of a phenomenon known as the urban heat island effect.

城市特别容易受到气候变化的侵害，因为有一种被称为城市热岛效应的现象。

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The world’s urban centers—many are coastal—are increasingly exposed to rising sea levels and other consequences of climate change.

专家警告说，世界各个城市中心区——很多都是沿海城市——日益暴露在海平面升高和其他气候变化后果面前。

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Pollution in waters near the region's urban centers also hurts fish stocks. Another threat is climate change.

亚洲地区靠近城市中心水域的污染同样也在伤害鱼类资源。

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As the world's leading environmental figures gather in Durban, South Africa for the 2011 United Nations Conference on Climate Change ( COP17), CNN asked two urban climate change experts to explain the complex role of cities.

CNN: Could big cities lead the fight against climate change?

Dr Stephen Hammer is co-director of the Urban Climate Change Research Network, a consortium of academics and institutions dedicated to the analysis of climate change mitigation, and an adviser to New York City's Energy Policy Taskforce.

CNN: Could big cities lead the fight against climate change?

The objective of World Water Day 2011 is to focus international attention on the impact of rapid urban population growth, industrialization and uncertainties caused by climate change, conflicts and natural disasters on urban water systems.

UNESCO: World Water Assessment Programme (WWAP)