Is there a normal amount of Carbon Footprint?

I don't get it. When you calculate your carbon footprint, you consider things like the number of miles you drive to places within a year, and how much electricity that you uses which I agree with. But, then it seems that you're also supposed to consider...

http://science.howstuffworks.com/science-vs-myth/everyday-myths/does-hybrid-car-production-waste-offset-hybrid-benefits1.htm

A friend of mine sent me a infograph about how much CO2 is produced from a single spam email. In the infograph it said, "The average GHG emission associated with a single spam message is 0.3 grams of CO2" I'm not sure the the claim is a valid...

All those trees being cut down inevitably emits a vast amount of carbon dioxide...but approximately what is the carbon footprint of Christmas? Dare I ask? Cringe...

I feel that one of the simplest ways to solve global warming and reduce your carbon footprint is simply plant a tree. We take little account into this solution, but think about this: if 6-7 billion people planted just one tree, that would be enough to...

I am looking for any type of tax that corporates pay in regards to environment sustainability. For example, do they have to pay tax on amount of carbon footprint they produce? or amount of waste that they generate?

a. Venus' total carbon amount is much greater than that of Earth's total carbon because the carbon in Venus' atmosphere greatly exceeds that in Earth's atmosphere. b. Earth has far more carbon in it's fossil fuel (oil & coal) than Venus has in its...