Energy Saving Bulbs

If the average UK family swapped 3 normal 100watt traditional bulbs for 20watt energy saving bulbs they would prevent 120kg of CO2 being released into the atmosphere. Each bulb would save its owner £9 per year or £100 over its lifetime.
The accumulative effect of cost savings like this, taken in concert with other savings suggested elsewhere in this site could really add up to a quite substantial amount.