Another look at inadequate Copenhagen pledges

Joeri Rogelj and others argue that Copenhagen Accord pledges are paltry in a Nature Opinion,

Current national emissions targets can’t limit global warming to 2 °C, calculate Joeri Rogelj, Malte Meinshausen and colleagues — they might even lock the world into exceeding 3 °C warming.

  • Nations will probably meet only the lower ends of their emissions pledges in the absence of a binding international agreement
  • Nations can bank an estimated 12 gigatonnes of Co2 equivalents surplus allowances for use after 2012
  • Land-use rules are likely to result in further allowance increases of 0.5 GtCO2-eq per year
  • Global emissions in 2020 could thus be up to 20% higher than today
  • Current pledges mean a greater than 50% chance that warming will exceed 3°C by 2100
  • If nations agree to halve emissions by 2050, there is still a 50% chance that warming will exceed 2°C and will almost certainly exceed 1.5°C

Via Nature’s Climate Feedback, Copenhagen Accord – missing the mark.

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