Scientists get green light for a cleaner world

Stumbling out of bed in the morning, your thoughts turn to a wakeup cup of tea or coffee. You know what you want to drink, but what about the cup. What's the green choice: paper, china or polystyrene?

Many might say the china cup. But what if we count in the energy spent to make it and the water used to wash it?

You would have to use a china cup at least 1,000 times before it would be environmentally better than polystyrene.