Study shows that 92.2 percent of tree cover loss in the Democratic Republic of Congo (DRC) and 48.2 percent in the Republic of Congo (ROC) is linked to small-scale shifting cultivation. Global Land Analysis and Discovery (GLAD) and World Resources Institute’s Congo team mapped the rural complex of DRC and ROC, with forest fragmentation to differentiate between the rural complex, fragmented forest and undisturbed forest. The DRC and ROC rural complex maps together enable better understanding which loss is caused by shifting cultivation cycling back to previously farmed areas, and which shows new deforestation, degradation or fragmentation.

Many tropical forests around the world have been severely fragmented as human disturbance split once-contiguous forests into pieces. Previous research indicates trees on the edges of these fragments have higher mortality rates than trees growing in the interiors of forests. Researchers used satellite data and analysis software they developed to figure out how many forest fragments there are, and the extent of their edges. They discovered that there are around 50 million tropical forest fragments in the world today. When they calculated how much carbon is being released from tree death at these edges, they found a 31% increase from current tropical deforestation estimates.