The world’s 9.9 billion acres of forest absorb roughly a quarter of human emissions of carbon dioxide, and help limit the increase of the gas in the atmosphere. While many healthy forests are robustly absorbing carbon, others are threatened by a warming climate. 

 
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NYT map http://www.nytimes.com/interactive/2011/10/01/science/earth/forests.html?ref=earth
Additional coverage http://www.h2brasil.com/artigos-publicados/o-manejo-de-florestas-e-as-m