New York Times: In decades of public debate about global warming, one assumption has been accepted by virtually all factions - that tackling it would necessarily be costly. But a new report casts doubt on that idea, declaring that the necessary fixes could wind up being effectively free. A global commission will announce its finding on Tuesday that an ambitious series of measures to limit emissions would cost $4 trillion or so over the next 15 years, an increase of roughly five per cent over the amount that would...