Diane Williams paid over $3k for home insulation, but now thinks her house is colder than before.

China, as the world's biggest energy consumer, has set itself a goal of generating 15 per cent of its electricity from renewable sources by 2020.

A year on, Michael Dickison finds a Government keen to improve its world image while its citizens struggle on.

New Zealand bio-fuel company LanzaTech has been recognised as a world-leader in energy innovation