Cycling is one way a household can significantly reduce its contribution to the pollution that causes climate change. Cars produce an average of 0.3 kg of CO2 per km travelled. A cyclist emits negligible greenhouse orother pollution. So for each kilometre you ride your bike instead of driving, you are saving approximately 0.3 kg of CO2. This is equivalent to the energy from running a 60 watt incandescent light globe for close to 5 hours.