The y-axis to the right represents the level of excess resources available for population growth the level of resources available per capita resources increasing as population increases the population available to use the resources

the level of resources available per capita

Explanation:

Population growth and prosperity are the main drivers of growth in the use of natural resources. The consumption of resources is expected to be "disconnected" from economic growth, and for producers to do "more with less". The world would consume three times more natural resources by the middle of this century than today, according to a United Nations report.

this is a good question! i'll do some research and come back when i have the answer!