Carbon Footprint Human beings compared with cars

Question

I know my Mondeo diesel produces 159g/Km of Co2

If I were to walk I Km how much Co2 would I produce (then multiply that by 5 Billion)

Answer 1

man209663's analysis looks good.

And yes, the population of humans is not 5 billion ... it is 6.3 billion.

So yes, if humans did nothing but breathe, then the carbon foot print of a human is negligible.

But humans do more than just breathe.   We drive Modeo diesel engines.  We get our food in over-packaged packets that require the burning of coal to produce.  We require a constant barrage of ships, trains, and trucks to bring that food to us.    Even the kind of food we eat creates a bigger carbon footprint than other species ... burning down forests to make room for cattle farms for beef not only burns yet more carbon into the air, but replaces carbon consuming forests, with carbon and methane producing cattle.

Answer 2

LOOOOOOOOOL

Answer 3

Humans don't have a carbon footprint.  You can only exhale carbon that you eat, and you can only eat temporarily fixed carbon.  Isn't that interesting?

You can't eat coal.  It seems like there'd be an exception to that somewhere, doesn't it?

Answer 4

Exactly as Firebird has said but population is now 6.3 Billion not 5!

1km would expand approx 100 to 200 calories! depending on pace and other factors so 150 calories = 628 Joules. then enthalpy of formation of CO2 is 393.5 kJ/mol so 0.628/393.5 = 0.0016 moles/co2 = 0.07g CO2 (based on mass = 44)

or about 2,272 times more energy efficient than your mondeo!

but as this energy is ONLY from renewable sources the nett effect os all humans on the CO2 balance from respiration is zero