他承诺在2020年削减温室气体排放量的17 % ， 并声称他无法容忍在该领域无所作为，但在2010年中期选举共和党大获全胜后，他便不再提及这一问题。
After committing to a 17% reduction of greenhouse-gas emissions by 2020 – and despite his declaration that he would not tolerate inaction in this area – he simply stopped raising the issue after the Republicans’ sweeping victory in the November 2010 mid-term elections.