A report out today says the government's Emissions Trading Scheme (ETS) could cost twice as much as originally estimated.

A parliamentary committee's report on ETS was unable to find common ground among the political parties.

A prominent British science writer has slammed New Zealand's clean, green reputation, calling it a "green mirage".

Taxpayers will be stuck with 84 per cent of NZ's Kyoto Protocol bill, while farmers and industrial emitters get hefty subsidies, a study says.

New Zealand's largest exporter, Fonterra, says it will receive no protection under planned changes to the emissions trading scheme.