How Green Is Your Supermarket?

With food thought to account for at least 20% of the UK's greenhouse gas emissions, our grocery basket can have a big impact on our environment. Greenpeace say British supermarkets are producing about 900,000 tons of plastic packaging every year. That means if they go `green', so do we. Jonathan Maitland examines the Green credentials of Britain's biggest supermarkets, and asks what people can do as consumers to play their part.