Another study under way at the Pew Centre on Global Climate Change, another think-tank, sizes up a $15 carbon price using data on the past effects of rising energy prices on industry.

皮尤全球气候变化中心（另一个智囊机构）正在进行另一份研究，这份研究利用能源价格上升对各行业的影响，把碳价格估计定在15美元每吨。

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Several studies by the Pew Centre in recent years have concluded that dwindling participation rates have not reduced the accuracy of political polling.

ECONOMIST: Political polls

Still, Susan Urahn, managing director of the Pew Centre on the States, argues that small reforms can make a big difference over time.

ECONOMIST: States face a looming pensions crisis

It helps that the sort of people who do not have landlines are also the sort who tend to turn out in relatively low numbers in mid-term elections, notes Scott Keeter of the Pew Centre.

ECONOMIST: Political polls