Thickness of a Hair

Imagine 1 kilometre of atmosphere and we want to get rid of the carbon pollution in it created by human activity. Let's go for a walk along it.
The first 770 metres are Nitrogen.
The next 210 metres are Oxygen.
That's 980 metres of the 1 kilometre. 20 metres to go.
The next 10 metres are water vapour. 10 metres left.
9 metres are argon. Just 1 more metre.
A few gases make up the first bit of that last metre.
The last 38 centimetres of the kilometre - that's carbon dioxide. A bit over one foot.
97% of that is produced by Mother Nature. It's natural.
Out of our journey of one kilometre, there are just 12 millimetres left. Just over a centimetre - about half an inch.
That's the amount of carbon dioxide that global human activity puts into the atmosphere.
And of those 12 millimetres Australia puts in .18 of a millimetre.
Less than the thickness of a hair. Out of a kilometre!