. Choose an efficient vehicle. Cars which give better mileage emit upto half the carbon into atmosphere causing less global warming. (See FuelEconomy.Gov Find and Compare Cars feature.)
. Replace light bulbs with compact fluorescent bulbs. Save cost on Energy and less carbon into atmosphere. it lasts longer as well.
. Buy Energy Efficient electrical appliances. Look for Energy Star label on new appliances or visit their website at EnergyStar.Gov to find the most energy-efficient products.
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In the summer, you could try using a solar cooker for at least some of your meals, especially on the weekend. Building one could be a family project. The sun delivers almost 1000 watts of power per sq. meter. I have some designs at http://www.alternative-energy-source.org that almost anybody could try. The construction cost is minimal. The oven design information is free.