Getting to Zero Carbon Emissions – What Can Cities Do?


Rethinking wedges(9 page pdf, Steven J Davis, Long Cao, Ken Caldeira and Martin I Hoffert, Environmental Research Letters, Jan. 9, 2013)

Also discussed here: The link between a global 2 °C warming threshold and emissions in years 2020, 2050 and beyond(9 page pdf, Chris Huntingford, Jason A Lowe, Laila K Gohar,Niel H A Bowerman, Myles R Allen,, Sarah C B Raper and Stephen M Smith, , Environmental Research Letters, Mar. 5, 2012)
Today we review a recent approach to achieving climate equilibrium using advanced global climate models and as many as 31 scenarios of emission reductions, each identified with certain strategies as a “wedge”.  The wedge concept was introduced in 2004 and that time only 7 wedges were necessary. With the continued increase in carbon emissions since then, the goal has become more challenging and may (or will) require negative emissions by scavenging CO2 from the atmosphere,  in addition to achieving zero emissions into it. As ¾’s of the global emissions come from cities and most of that comes from vehicle emissions and the heating and cooling of buildings, the primacy of the role of Mayors and their citizens is clear, as demonstrated by Mayor Bloomberg in New York City in PlaNYC 2030 and, globally,  in leading the C40 initiative over the last 8 years of his administration. One hopes that other Mayors will step up to the plate.

wedges zero emissions

To see Key Quotes and Links to key reports about this post, click HERE

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