There are plenty of ways for individuals to make a difference in the battle against green-house gasses; many of them start with your home.
Your home contributes carbon dioxide during its construction, its heat leakage, and also the way in which you live in it. For the last reason, much of this can be attributed to the efficiency of your electrical appliances and where you get your energy from.
Advances are made all of the time in energy efficiency, although sometimes this is achieved by sacrificing functionality of the appliances.
The other option for improving your homes carbon footprint is to buy your energy from renewable sources, or, alternatively, to buy a renewable energy source which can be installed on your property; such as a wind turbine, solar panels, and various heat generators; like a heat sink or thermal solar panel.