50 litres of petrol produces 140 kg of carbon emissions, so if you take public transport for regular trips to work or school, you are reducing your emissions considerably.

If there is no convenient public transport between your home and workplace, a good alternative is to organize a car pool with fellow workers.

Switching on the air conditioner increases fuel consumption by 10-20%. Unless it is extremely hot, simply opening the car windows is often enough to keep the car comfortable. However, open windows increase wind drag (and therefore fuel consumption), particularly at high speeds.

Below 80 kph it's more fuel efficient to drive with the air conditioning off and windows down, but at higher speeds it is better to close the windows and use the air conditioner, if needed.

For many jobs, you just have to be there, but working from home sometimes, if you can, reduces your transport emissions. Perhaps you can log in to your work computer from home and spend the day doing whatever you would have done if you were at the office.

If you have the sort of job that involves interstate or overseas travel for business meetings, you can ask your company to install video-conferencing equipment so that you can have virtual meetings without leaving your office. Aircraft emissions are particularly damaging because they occur at high altitudes, so any IT investments that reduce the need to travel are very worthwhile.