Taking care of the planet by reducing carbon footprints is the responsibility of all global citizens. A carbon footprint is defined as the total amount of greenhouse gases produced to directly and indirectly support human activity. Your carbon footprint is the sum of all emissions of CO2 (carbon dioxide), which were induced by your activities in a given time frame - typically a year. Individuals who take steps to reduce their carbon footprints can have a dramatic impact on their own lives and the lives of those who come after them.

• Make changes to transportation. Transportation accounts for almost half of all air pollution and more than one-third of greenhouse gas emissions, says the David Suzuki Foundation, a Canadian conservation group. Walking, biking or taking mass transit to get around can reduce your carbon footprint. If you must drive, stick to the speed limit, accelerating and stopping smoothly. Also, maintain your vehicle so it operates as efficiently as possible.
• Opt out of junk mail. CarbonFund.org says the energy used to produce, deliver and dispose of junk mail produces more greenhouse gas emissions than 2.8 million cars combined. Choose email options for marketing information and bills and ask companies to reduce the amount of paper correspondence they distribute. The organization 41Pounds.org will contact direct-mail companies for you and eliminate unnecessary junk mail for a nominal fee.
• Consider solar power. Solar panels installed on the roof of your home can reduce your reliance on electricity and natural gas. Solar companies may offer financing options to minimize upfront costs. Some states have a "net metering" law, which may enable you to eliminate your electricity bill or even earn money by selling electricity back to the grid.
• Choose local foods. Food production and transportation increases greenhouse gas emissions. Select locally grown and organically produced food. In so doing, you're not only helping the environment, but you're also helping local business owners.

There are many ways for concerned citizens to reduce their carbon footprints. Small changes can quickly add up to large, far-reaching results.