Data on tropical forest cover is so poor that we do not know if the forests are declining, a study has found.Alan Grainger from the UK's University of Leeds examined UN analyses going back almost 30 years, and found that "evidence for a decline is unclear".
Writing in Proceedings of the National Academy of Sciences (PNAS), he proposes a global forest monitoring system.
The UN admits there are problems with the data, but says tropical forests are certainly in retreat.
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