Summary
Natural carbon sinks currently absorb approximately half of the anthropogenic CO2 emitted by fossilfuel burning, cement production and land-use change. However, this airborne fraction may change inthe future depending on the emissions scenario. An important issue in developing carbon budgets toachieve climate stabilisation targets is the behaviour of natural carbon sinks, particularly under lowemissions mitigation scenarios as required to meet the goals of the Paris Agreement. A key requirementfor low carbon pathways is to quantify the effectiveness of negative emissions technologies which will bestrongly affected by carbon cyclefeedbacks. Here we find that Earth system models suggest significantweakening, even potential reversal, of the ocean and land sinks under future low emission scena
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