For example, large companies like Google and GM purchase emissions credits from the carbon markets to allow them to claim that their overall carbon emissions is zero.

FORBES: BY DENNIS POSADAS

But if the gap between what can be achieved and the high ambition of Global Zero grows too wide, its claim to temper idealism with gritty pragmatism will be in jeopardy.

ECONOMIST: Banning the bomb will be hard, but not impossible

Icelanders claim that charging 5.5% interest over 15 years is extortionate in an era of near-zero base rates.

ECONOMIST: Worse: a ceremonial president wielding superpowers