Integrated Assessment of Carbon Dioxide Removal

To maintain the chance of keeping the average global temperature increase below 2°C and to limit long‐term climate change, removing carbon dioxide from the atmosphere (carbon dioxide removal, CDR) is becoming increasingly necessary. We analyze optimal and cost-effective climate policies in the dynam...

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Veröffentlicht in:Earth's future 2018-03, Vol.6 (3), p.565-582
Hauptverfasser: Rickels, Wilfried, Reith, Fabian, Keller, David, Oschlies, Andreas, Quaas, Martin F
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container_title Earth's future
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creator Rickels, Wilfried
Reith, Fabian
Keller, David
Oschlies, Andreas
Quaas, Martin F
description To maintain the chance of keeping the average global temperature increase below 2°C and to limit long‐term climate change, removing carbon dioxide from the atmosphere (carbon dioxide removal, CDR) is becoming increasingly necessary. We analyze optimal and cost-effective climate policies in the dynamic integrated assessment model (IAM) of climate and the economy (DICE2016R) and investigate (1) the utilization of (ocean) CDR under different climate objectives, (2) the sensitivity of policies with respect to carbon cycle feedbacks, and (3) how well carbon cycle feedbacks are captured in the carbon cycle models used in state-of-the-art IAMs. Overall, the carbon cycle model in DICE2016R shows clear improvements compared to its predecessor, DICE2013R, capturing much better long‐term dynamics and also oceanic carbon outgassing due to excess oceanic storage of carbon from CDR. However, this comes at the cost of a (too) tight short-term remaining emission budget, limiting the model suitability to analyze low-emission scenarios accurately. With DICE2016R, the compliance with the 2°C goal is no longer feasible without negative emissions via CDR. Overall, the optimal amount of CDR has to take into account (1) the emission substitution effect and (2) compensation for carbon cycle feedbacks.
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subjects Atmospheric models
Carbon
Carbon cycle
Carbon Cycle Feedbacks
Carbon cycle models
Carbon dioxide
Carbon Dioxide Removal
Climate
Climate change
Climate effects
Climate models
Climate policy
Cost analysis
DICE
Emission analysis
Emissions
Emissions control
Environmental policy
Global temperatures
Integrated Assessment Models
Negative Emissions
Outgassing
Policies
Temperature rise
title Integrated Assessment of Carbon Dioxide Removal
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