This site seems to give a decent Carbon footprint estimate for an individual or a family.

http://www.nature.org/initiatives/climatechange/calculator/?src=spl6

Here is a great website showing a visual simulation in real-time showing the carbon dioxide (CO2) emissions, birth rates, and death rates of every country in the world.

http://www.breathingearth.net/

Here is another calculation for CO2 emission by simple human breathing, some say our breathing is carbon neutral.

"On average, a human will breath 16 times per minute.

Each breath will contain, on average, 0.037 grams of CO2.

An average year is 525948.766 minutes.

An average human will live to be 67 years old.

This means that the average CO2 exhaled by the average human in her lifetime will be 20861230 grams, or 23 tons.

That’s a lot of mass, but this value is hard to compare to anything. The average CO2 exhaled by all humans in one year is 2230000000 tons, or 2.23 gigatons."

"The current mass of CO2 in the atmosphere is 3000000000000 or 3 teratons 4. The amount of CO2 added to the atmosphere by human respiration is obviously miniscule."
Source(s):
http://atmoz.org/blog/2007/05/01/direct-co2-emissions-by-humans/

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