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Title: What would it take to achieve the Paris temperature targets?

Abstract

Here, the 2015 Paris Agreement aims to limit warming to 2 or 1.5°C above preindustrial level, although combined Intended Nationally Determined Contributions (INDCs) are likely insufficient to achieve these targets. We propose a set of idealized emission pathways consistent with the targets. If countries reduce emissions in line with their INDCs, the 2°C threshold could be avoided only if net zero greenhouse gas emissions (GHGEs) are achieved by 2085 and late century negative emissions are considerably in excess of those assumed in Representative Concentration Pathway (RCP) 2.6 (net –5 Gt CO 2/yr, compared with –1.5 Gt CO 2/yr in RCP2.6). More aggressive near-term reductions would allow 2°C to be avoided with less end-of-century carbon removal capacity. A 10% cut in GHGEs by 2030 (relative to 2015) could likely achieve 2°C with RCP2.6 level negative emissions. The 1.5°C target requires GHGEs to be reduced by almost a third by 2030 and net zero by 2050, while a 50 year overshoot of 1.5°C allows net zero GHGEs by 2060.

Authors:
 [1];  [1];  [1]
  1. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1438457
Grant/Contract Number:  
FC02-97ER62402
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 13; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Sanderson, Benjamin M., O'Neill, Brian C., and Tebaldi, Claudia. What would it take to achieve the Paris temperature targets?. United States: N. p., 2016. Web. doi:10.1002/2016GL069563.
Sanderson, Benjamin M., O'Neill, Brian C., & Tebaldi, Claudia. What would it take to achieve the Paris temperature targets?. United States. doi:10.1002/2016GL069563.
Sanderson, Benjamin M., O'Neill, Brian C., and Tebaldi, Claudia. Mon . "What would it take to achieve the Paris temperature targets?". United States. doi:10.1002/2016GL069563. https://www.osti.gov/servlets/purl/1438457.
@article{osti_1438457,
title = {What would it take to achieve the Paris temperature targets?},
author = {Sanderson, Benjamin M. and O'Neill, Brian C. and Tebaldi, Claudia},
abstractNote = {Here, the 2015 Paris Agreement aims to limit warming to 2 or 1.5°C above preindustrial level, although combined Intended Nationally Determined Contributions (INDCs) are likely insufficient to achieve these targets. We propose a set of idealized emission pathways consistent with the targets. If countries reduce emissions in line with their INDCs, the 2°C threshold could be avoided only if net zero greenhouse gas emissions (GHGEs) are achieved by 2085 and late century negative emissions are considerably in excess of those assumed in Representative Concentration Pathway (RCP) 2.6 (net –5 Gt CO2/yr, compared with –1.5 Gt CO2/yr in RCP2.6). More aggressive near-term reductions would allow 2°C to be avoided with less end-of-century carbon removal capacity. A 10% cut in GHGEs by 2030 (relative to 2015) could likely achieve 2°C with RCP2.6 level negative emissions. The 1.5°C target requires GHGEs to be reduced by almost a third by 2030 and net zero by 2050, while a 50 year overshoot of 1.5°C allows net zero GHGEs by 2060.},
doi = {10.1002/2016GL069563},
journal = {Geophysical Research Letters},
issn = {0094-8276},
number = 13,
volume = 43,
place = {United States},
year = {2016},
month = {6}
}

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