The Yangtze River provides one third of the country's freshwater resources, but it has met lots of environmental problems in recent years, such as heavy pollution and overfishing.

长江提供全国三分之一的淡水资源，但它近年来遇到了很多环境问题，如重污染和过度捕鱼。

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Four-tier alerts - blue, yellow, orange and red - will be issued on "heavy pollution" days.

在空气重污染情况下将会发出预警，霾的预警级别由低到高分别为蓝色、黄色、橙色和红色四个等级。

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TEDA restricts the introduction of projects with high consumption of energy, heavy pollution and low technology.

天津开发区限制引进“两高一低”（高能耗、高污染和低技术）型项目。

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But this plan has also come under criticism. The proposed power plants will burn heavy oil, which must be imported and causes pollution.

VOA: standard.2009.08.28

Heavy pollution cuts into the usable water supply, but treatment equipment is expensive.

ECONOMIST: China

Smog also spread across central and eastern regions as a yellow haze alert was issued yesterday, and "heavy to severely heavy pollution" was recorded in Beijing, China Daily reports.

BBC: China media: No support for Abe

Following the heavy pollution of the beach, the local population of this starfish fell from more than a hundred and fifty to just thirteen, pushing this particular colony to the edge of extinction.

BBC: News | UK | West Wales recovering from 'environmental disaster'