知识世界

Environment:Thirsty Planet（2）

All across the planet， more and more urban communities are joining the ranks of the mega-cities – the cities with populations of ten million or more. And all these millions of people crammed together in tight spaces need water. But water can no longer be taken for granted. Available supplies simply cannot keep pace with the rapid growth. The water shortages reached crisis proportions long ago.

• 01

  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

  
• 10

  Environment： It's in the Water