Before the United Nations Climate Change Conference (COP15) held in December 2009 in Copenhagen, the Brazilian media picked up the issue of REDD (Reduction of Emissions from Deforestation and Forest Degradation). A variety of somewhat conflicting statements came from all quarters: the scientific community, government authorities, environmental NGOs and other interest groups. As expected, they spanned a wide range of views on the issue.
Broadly speaking, tropical deforestation has been declining. Thus, a fundamental question has been put forward: are land-use change emissions of GHGs quantitatively significant enough to warrant a special mechanism under the UNFCCC? Some critics of REDD maintain that emissions from tropical land-use change are not as large as has been assumed, and that it is not as important as emissions from other sectors such as fossil fuel combustion.
Even before I get into the details, let me emphasize that tropical deforestation and REDD are still just as significant as before, and as important, for instance, as the share from transportation emissions. As I will describe in this post, the latest calculations using new data that has become available after the last IPCC report (2007)—following the same methodology as the IPCC—shows that the share of tropical land-use change in overall CO2 emissions has fallen. However, looking at the big picture, tropical deforestation is still a massive issue to tackle in the battle against climate change and attention should not be diverted from REDD.