知识世界

Environment:Techno 2100 —— The Clean Air Act

Fresh air is essential to all lifves, but the air we breathe are often taken from breath. Unfortunately, it is often polluted by cars, lorry, power plants and oil refinery, even mow the lawn could deposit pollutant to the air. The Clean Air Act originally got through in 1970 was a way to make sure that every American has clean air to breathe. So how has it helped locally, regionally and globally?

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  Environment： Thirsty Planet（1）

  
• 02

  Environment： The Infinite Voyage —— Crisis in the Atmosphere

  
• 03

  Environment： Ice Worlds: Life at the Edge

  
• 04

  Environment： Waves in the Ocean

  
• 05

  Environment： Something in the Air

  
• 06

  Environment： Building Blocks

  
• 07

  Environment： The Pond - Community Ecology in Action

  
• 08

  Environment： The Endless Voyage — Survivors

  
• 09

  Environment： The Nature of Things——The Living City

  
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  Environment： It's in the Water