Safe vs. Fair: A Formidable Trade-off in Tackling Climate Change

Sustainability

Massimo Tavoni¹  Shoibal Chakravarty² 

[1] Fondazione Eni Enrico Mattei (FEEM) and Euro-Mediterranean Center on Climate Change (CMCC), Corso Magenta 63, 20123 Milano, ItalyPrinceton Environmental Institute, Princeton University, Nassau Hall, Princeton, NJ 08544, USA;

关键词: climate policy;    burden sharing;    negative emissions;   

DOI  :  10.3390/su4020210

来源: mdpi

【 摘 要 】

Global warming requires a response characterized by forward-looking management of atmospheric carbon and respect for ethical principles. Both safety and fairness must be pursued, and there are severe trade-offs as these are intertwined by the limited headroom for additional atmospheric CO₂ emissions. This paper provides a simple numerical mapping at the aggregated level of developed vs. developing countries in which safety and fairness are formulated in terms of cumulative emissions and cumulative per capita emissions respectively. It becomes evident that safety and fairness cannot be achieved simultaneously for strict definitions of both. The paper further posits potential global trading in future cumulative emissions budgets in a world where financial transactions compensate for physical emissions: the safe vs. fair tradeoff is less severe but remains formidable. Finally, we explore very large deployment of engineered carbon sinks and show that roughly 1,000 Gt CO₂ of cumulative negative emissions over the century are required to have a significant effect, a remarkable scale of deployment. We also identify the unexplored issue of how such sinks might be treated in sub-global carbon accounting.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.