There are some easy and quick steps people can take if they want to have an impact on their carbon footprint.
1) Drive slower - drive 5 km under the speed limit. On the highway most people are still driving 10 to 20 km over the speed limit.
2) Reduce the temperature in your house - set the heating in the house to about 18 degrees unless you heat with electricity and therefore already have no carbon impact.
When I see people driving slower and driving in such a way to reduce their use of gas, then I will believe that people take global warming seriously.