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Global Forest Estimate Rises 9 Percent

Dryland biomes are covered in at least 40 percent more forest than previously estimated.

May 15, 2017
Aggie Mika

WIKIMEDIA, ARTHUR MEDEIROS

          An international team of scientists uncovered 1,803,097 square miles (467 million hectares) of previously unreported forest populating Earth’s dryland biomes, boosting forest cover globally by at least 9 percent, according to a study published last week (May 11) in the journal Science. This update estimates that forest cover in drylands is 40-47 percent higher than what has previously been found. 

Jean-François Bastin, first author on the study and an ecologist with the Food and Agriculture Organization of the United Nations, told Mongabay that he and his colleagues were “surprised and stunned” at their new estimates.

In their report, the researchers demonstrated that in 2015, out of the estimated 23.67 million square miles (6,132 million hectares) of total dryland covering the earth’s surface, 4.16 million square miles were covered in forest, while another 5.12 million square miles of dryland (1,327 million hectares) boasted more than 10 percent tree cover.

Previous studies attempting to describe forests in dryland biomes were “riddled with disparities, caused by issues such as differences in satellite spatial resolution, mapping approaches and forest definitions,” according to a press release.

In their approach, the researchers used Google Earth’s satellite data and images taken at a high frequency and resolution, which allowed for a more accurate estimate.

According to a Science report, this updated estimate will enable researchers to more accurately determine how much carbon dioxide absorption the Earth’s forests can account for. 

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