Reductions - Transport
Changing attitudes to transport can make a big difference to carbon emissions:
||kg of CO2 saved annually (per person)
|Use the channel tunnel instead of flying to France
|Car sharing for the school run
|Getting supermarket shopping delivered
|Walk instead of drive for journeys under 3 miles
|Give up your car altogether and use public transport
|Go for a run instead of driving to the gym
|Do one large shopping trip rather than many small ones
Other things you may want to consider:
Cars use 25% less fuel at 55mph than at 70mph - drive slower. This would also save money - fuel is expensive!
Smooth driving can save 30% on fuel consumption, reducing carbon emissions - this means reducing the amount of sharp braking and sharp accelerating while you drive.
Underinflated tyres can increase fuel consumption by 2%, increasing the running costs of your car and also increasing the carbon it emits. Check your tyres regularly. 
Roofracks and bull bars increase drag, and consumption by up to 5%, again increasing emissions - take them off when they're not needed. 
Air conditioning can add 10% to consumption - do you really need it on all the time you're in the car? 
One long haul flight can increase footprint by up to 24% - isn't there anywhere closer to home you could go to for a holiday?