Why Is The Ground Brown

Ecologists have long asked, Why is the world green? In other words, why aren't herbivores, such as insects and grazing animals, more successful at eating the world's green leaves, also known as plant biomass?

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<p><a href="http://www.physorg.com/news64045379.html">Why Is The Ground Brown</a></p> <p>Ecologists have long asked, Why is the world green? In other words, why aren't herbivores, such as insects and grazing animals, more successful at eating the world's green leaves, also known as plant biomass? </p>