One's ecological footprint is the amount of renewable and non-renewable ecologically productive land area required to support one's resource demands and absorb one's wastes.

When one's footprint exceeds the amount of renewable biocapacity then this is considered biologically and ecologically unsustainable. If everyone lived like this, we would all die.

There are several sites where you can test yourself. Just type "ecological footprint" into Google. I haven't listed them here because URLs can be so ephemeral.

hectares per person
Available in the world 1.8
Australia (average) 7.6
Me in Australia 6.8
UK (average) 5.3
Me in UK 3.5

Showing once again what greedy arseholes the West are, especially Australia.