News tagged with water stress

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Time to find a second Earth, WWF says

Carbon pollution and over-use of Earth's natural resources have become so critical that, on current trends, we will need a second planet to meet our needs by 2030, the WWF said on Wednesday.

Oct 13, 2010 3.4 / 5 (17) 46

Going out on a (redwood tree) limb

How tall can a tree grow? Does sunlight or water limit the size and photosynthetic capacity of a leaf? Could constraints on leaf growth really determine the height of a tree? These are all questions that ...

Jun 28, 2010 5 / 5 (6) 0