Carbon emission offsets need to rise to $200 per tonne, says IEA

The cost of carbon dioxide emissions would need to be at least $200 per tonne - many times today's levels - to deliver the cuts scientists propose will be needed to avert the threat of global warming, the International Energy Agency said yesterday. The rich countries' energy watchdog warned that the cost of emissions, set by trading schemes or carbon taxes, would need to be that high to make investment in technologies such as hydrogen-fuelled vehicles commercially viable.