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Pathways for balancing CO2 emissions and sinks.
Brian Walsh1, Philippe Ciais2, Ivan A Janssens3
1International Institute for Applied Systems Analysis, Schlossplatz 1, A-2361 Laxenburg, Austria.
Nature Communications
|April 14, 2017
Summary
Global decarbonization requires emissions to peak within 10 years. Reducing fossil fuel consumption is critical to meet climate targets, especially if negative emissions technologies are unfeasible.
Area of Science:
- Climate Science
- Energy Systems Analysis
- Environmental Policy
Background:
- The 2015 Paris Agreement committed nations to global net decarbonization before 2100 to reverse anthropogenic climate change.
- The agreement lacks specific mitigation strategies, leading to diverse national approaches.
- Understanding emissions pathways is crucial for achieving climate targets.
Purpose of the Study:
- To project energy and land-use emissions mitigation pathways through 2100.
- To assess the feasibility of meeting COP21 targets under various scenarios.
- To analyze the impact of carbon-climate feedbacks on mitigation strategies.
Main Methods:
- Utilized best-available parameterization for carbon-climate feedbacks and interdependencies.
- Modeled energy and land-use emissions mitigation pathways.
- Projected emissions trajectories to the year 2100.
Main Results:
- Anthropogenic emissions must peak within the next decade to realistically meet COP21 targets.
- Fossil fuel consumption needs to fall below 25% of primary energy supply by 2100.
- Allowable fossil fuel consumption decreases significantly if negative emissions technologies are not viable.
Conclusions:
- Urgent emissions peaking is essential for achieving global climate goals.
- Significant reductions in fossil fuel reliance are necessary.
- The feasibility of negative emissions technologies critically impacts mitigation pathways.