What Does the 2 Degree C Target Imply for a Global Climate Agreement in 2020? The LIMITS Study on Durban Platform Scenarios

Kriegler E, Tavoni M, Aboumahboub T, Luderer G, Calvin K, De Maere G, Krey V, Riahi K, et al. (2013). What Does the 2 Degree C Target Imply for a Global Climate Agreement in 2020? The LIMITS Study on Durban Platform Scenarios. LIMITS Special Issue, FP7 LIMITS Project

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Abstract

This paper provides a novel and comprehensive model-based assessment of possible outcomes of the Durban Platform negotiations with a focus on emissions reduction requirements, the consistency with the 2 degrees C target and global economic impacts. The Durban Action scenarios investigated in the LIMITS study -- all assuming the implementation of comprehensive global emission reductions after 2020, but assuming different 2020 emission reduction levels as well as different long-term concentration targets -- exhibit a probability of exceeding the 2 degrees C limit of 20-40% when reaching 450 (450-480) ppm CO2e, and 35-55% when reaching 500 (480-520) ppm CO2e in 2100. Forcing and temperature show a peak and decline pattern for both targets. Consistency of the resulting temperature trajectory with the 2 degrees C target is a societal choice, and may be based on the maximum exceedance probability at the time of the peak and the long run exceedance probability, e.g. in the year 2100. The challenges of implementing a long term target after a period of fragmented near-term climate policy can be significant as reflected in steep reductions of emissions intensity and transitional and long term economic impacts. In particular, the challenges of adopting the target are significantly higher in 2030 than in 2020, both in terms of required emissions intensity decline rates and economic impacts. We conclude that an agreement on comprehensive emissions reductions to be implemented from 2020 onwards has particular significance for meeting long term climate policy objectives.

Item Type: Other
Uncontrolled Keywords: Climate change; Climate policy; 2 degrees; Durban Platform; Integrated assessment
Research Programs: Energy (ENE)
Transitions to New Technologies (TNT)
Bibliographic Reference: LIMITS Special Issue, FP7 LIMITS Project
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:49
Last Modified: 20 Jan 2016 16:48
URI: http://pure.iiasa.ac.at/10628

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