Hold on to that green cover

Forests play an even greater role in Earth’s climate system than previously known, according to the most comprehensive assessment yet of the carbon storage potential of the world’s wooded areas.

Between 1990 and 2007, the planet’s tropical, temperate, and boreal forests absorbed about 2.4 billion tons of carbon annually, or the equivalent of about one-third of fossil fuel emissions, and re-growth of trees in previously cleared lands absorbed an additional 1.6 billion tons, according to a study published in the journal Science.

During the same period, however, rampant deforestation — particularly in the world's tropical regions — released 2.9 billion tons of carbon annually. Overall, the planet’s forests provide a net carbon sink of about 1.1 billion tons of carbon, or the equivalent of about 13 percent of the emissions produced by humankind annually.

According to researchers, the findings suggest that forest protection should play an even more important role in strategies to protect the planet’s climate, including the emergence of carbon markets.