Comparing these plans, the writer puts the best is the 1st plan and expounds the water environmental issues after exploiting and protective measure of water resource at last.

对比各方案，推荐第一方案为较优方案，文章最后对水源地开采后的水环境问题及水资源保护措施进行了论述。

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Environmental issues, such as air pollution and water pollution, directly affect people's lives.

环境问题，如空气污染和水污染，直接影响人们的生活。

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Cities tend to struggle most with health-threatening environmental issues, such as the lack of safe water, sanitation and waste.

城市将受到那些威胁健康的环境问题的困扰，例如缺乏饮用水，卫生设施和废弃物处理设施。

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They also must provide detailed information about nearby water and environmental issues that could cause wildlife to gather near an airport.

VOA: special.2009.04.01

It is a future where we must strengthen our collaboration on critical environmental issues: cleaning up our air, land and water, fighting for environmental justice to relieve the burdens of pollution in poor and minority communities, protecting the planet we all call home and safeguarding the creation that has been given to us to steward.

WHITEHOUSE: EPA Administrator Lisa Jackson Delivers Keynote at the National Council of Churches' Centennial Gathering | The White House

As I discussed in my overview of hydroelectric power in 2008, the main barriers to new hydroelectric facilities are complex environmental studies, permitting issues, and water laws.

FORBES: Administration Lays the Groundwork for Hydropower Boom

Environmental issues such as clean air and water are major concerns of voters as this year's elections approach, according to a poll conducted for the League of Conservation Voters.

CNN: Environment is crucial issue for voters, poll shows