It is very unlikely that the combined global land and ocean sink will turn into a source by 2100 under scenarios without net negative emissions (SSP2-4.5, SSP3-7.0, SSP5-8.5).32 {4.3, 5.4, 5.5, 5.6, Box TS.5, TS.3.3} B.4.3 The magnitude of feedbacks between climate change and the carbon cycle becomes larger but also more uncertain in high CO 2 emissions scenarios