Keeping in mind that the average person has an annual 4 tonne carbon footprint, this would be one simple way for an individual to halve their emissions.
For example, if a working week commute was an 18 mile round trip daily, by changing from a single-occupancy vehicle (SOV) to Public Transport alternatives—the carbon footprint would be reduced annually by two tonne per person. Keeping in mind that the average person has an annual 4 tonne carbon footprint, this would be one simple way for an individual to halve their emissions.