Quick tips

• Think about the making. For gadgets and clothes, most of the footprint comes from making them, not using them.
• Cows weigh a lot. Beef, cheese and milk carry methane from cattle, so dairy and beef sit high on food lists.
• Watch the flights. One long flight can outweigh months of everyday driving.
• Heat is hungry. Heating homes, water and tumble dryers uses far more energy than lights or streaming.
• Save the clue. A clue reveals one figure for 25 points. Use it when two suspects look close.