August 20, 2009
Lending academic weight to concerns that environmentalists have long voiced, Nophea Sasaki and Francis E. Putz note that current definitions fail to effectively account for degradation of forests, including industrial logging and conversion of natural forests to some types of plantations. The result: an international climate framework could ignore substantial emissions from forest degradation, a process that reduces forest carbon stock and other ecosystem services, increases the risk of fire, and diminishes biodiversity.
Over the past decade global tropical deforestation was estimated to result in 1.1–2.2 billion tons year. Forest degradation is thought to have resulted in similar emissions.
To illustrate this case, Sasaki and Putz looked at inventory data for forest in central Cambodia. They estimate the forest contains 121.2 metric tons of carbon per hectare, of which 71.4 tons is locked up in trees attractive to loggers. Assuming all these trees were harvested, the area would lose 59 percent of its carbon but still be classified as forest. In the eyes of the UNFCCC, there would be no change in forest cover or carbon storage.
To reduce the impact of such a scenario, Sasaki and Putz recommend new definitions that differentiate natural forest from plantations and set higher thresholds for what counts as forest: a minimum canopy height of 5 meters and 40 percent forest cover. Of course the stricter definition could reduce incentives to conserve habitats with sparse vegetation or a low canopy, like Brazil's cerrado, a woody grassland that borders the Amazon rainforest, should they not qualify for carbon payments.
Still the authors are hopeful that a better "forest" definition will enable a post-Kyoto climate agreement to account for forest degradation so that it "will help ensure the sustainability of ecosystem services and protect the livelihoods of forest-dependent people while providing a low-cost option for reducing carbon emissions." New tools — in the sky and on the ground — will also help, improving the reporting and monitoring of forest degradation.
Nophea Sasaki and Francis E. Putz. Critical need for new definitions of "forest" and "forest degradation" in global climate change agreements. Conservation Letters 1755-263X http://dx.doi.org/10.1111/j.1755-263X.2009.00067.x
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