Warming assessment of the bottom-up Paris Agreement emissions pledges
Open Access
- 16 November 2018
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 9 (1), 1-10
- https://doi.org/10.1038/s41467-018-07223-9
Abstract
Under the bottom-up architecture of the Paris Agreement, countries pledge Nationally Determined Contributions (NDCs). Current NDCs individually align, at best, with divergent concepts of equity and are collectively inconsistent with the Paris Agreement. We show that the global 2030-emissions of NDCs match the sum of each country adopting the least-stringent of five effort-sharing allocations of a well-below 2 degrees C-scenario. Extending such a self-interested bottom-up aggregation of equity might lead to a median 2100-warming of 2.3 degrees C. Tightening the warming goal of each country's effort-sharing approach to aspirational levels of 1.1 degrees C and 1.3 degrees C could achieve the 1.5 degrees C and well-below 2 degrees C-thresholds, respectively. This new hybrid allocation reconciles the bottom-up nature of the Paris Agreement with its top-down warming thresholds and provides a temperature metric to assess NDCs. When taken as benchmark by other countries, the NDCs of India, the EU, the USA and China lead to 2.6 degrees C, 3.2 degrees C, 4 degrees C and over 5.1 degrees C warmings, respectively.This publication has 44 references indexed in Scilit:
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