Stop flying to save the environment

Air New Zealand is lauded for its commitment to limit its carbon footprint and yet the airline is one of the country's biggest climate polluters, responsible for emitting 3.5 million tonnes of C02 every year.Shaun Hendy is a physics professor and has voluntarily grounded himself because of his carbon footprint. Climate scientist James Renwick explains just which forms of travel are the greatest and least polluting.