A Parliamentary review of the Emissions Trading Scheme has heard that the science of global warming is unequivocal.
One of the committee's terms of reference, included at the insistence of the ACT Party, is to review the science around climate change.
New Zealand Climate Change Centre spokesperson David Wratt told the committee that both New Zealand and the planet as a whole are getting warmer.
He said that's not just the atmosphere: the oceans are warming, glaciers retreating and Arctic ice melting.
Dr Wratt says there's nothing in scientific literature that disputes the fact humans are affecting the climate.