A few large companies are responsible for the majority of New Zealand's greenhouse gas emissions. Who are they and what hope is there that they can do what's required to make the country carbon neutral? Joel MacManus and Anuja Nadkarni report. Every year, New Zealand pumps out 80 million tonnes of greenhouse gases into the atmosphere.

SkyCity is putting a copy of the world's most celebrated guide to reversing climate change in each of its hotel rooms. Chief executive Graeme Stephens referred to the book as the "new Gideons' Bible" while speaking at the first anniversary of the Climate Leaders Coalition, which is a group of more than 100 large companies aiming to make their businesses climate-friendly.