Remote sensing (the science of obtaining information about objects or areas from a distance, typically from aircraft or satellites) have been until now the main tool to assess the deforestation trends in many parts of the world. Global estimates about forest loss and carbon emissions depend mainly on this approach.
However, satellite images prevent counting up for "forest degradation" corresponding to selective logging, bush meat and other forest resources extraction. The impact of this process on carbon balance and ecological properties is still unknown, yet new findings point out it can be really important for global emissions.
If land based carbon projects plan to monitor project's compliance through remote sensing techniques, huge efforts beyond spatial modelling need to be done to expose this hidden mechanism.
"When you talk about degradation it is more cryptic. Chunks of the forest are affected but when you look from the satellite image you still see trees, you just don't know the condition, and that is why it is overlooked."