1. Carbon dioxide, methane , nitrous oxide, water vapour.
2. 2°C.
3. Floods, severe storms, loss of biodiversity, starvation, mass migration of people seeking homes, mass extinction of most life forms.
4. 10 billion.
5. Reduce speed (45-65mph is generally the most efficient speed); avoid short journeys (a cold engine uses twice as much fuel); drive smoothly – harsh acceleration and braking causes significant increase in fuel consumption); keep car well service ad and tuned; keep tyres at correct pressure for the load.
6. Air travel, home heating, car travel, electricity use.
7. Loft insulation, cavity wall insulation, double-glazing, draught-proofing doors and windows.
8. Wood, gas, oil, coal, electricity.
9. One third.
10. One third.
11. Pour it on the compost heap - it’s a good activator!
12. Less – 1.4 tons.
13. 1 ton.
14. Reduce them by about one quarter.
15. Recycle, compost, avoid packaging, re-use, repair, reduce.

Gain 1 mark if you get it all right and 0.5 if you get the answer at least half right!  The top score at Bookham Village Day was 13.5 - how did you do?