The use of the word "equity" to mean "average?

The map below is of CO₂ emissions (from Our World in Data). It labels countries as being either "Below global equity" or "Above global equity".

Here the word "equity" seems to have been used to mean "(world) average". Is such usage correct/common/acceptable?

Solution 1:

Here, equity is treated as allowed fair level of CO₂ to be emitted (by any country).

"Above global equity" = Above fair level

"Below global equity" = Below fair level

Global Carbon Project (G.C.P) or any respective international organization might have agreed upon on some fair level of CO₂ emission i.e. allowed level of CO₂ emission.

So, the countries in the red are emitting CO₂ than above fair level. Whereas, the countries in the blue are emitting CO₂ than below fair level.

Equity according to Oxford Dictionary is

Meaning (Entry 1): The quality of being fair and impartial.

Usage: The focus here has rarely been on equity or on a fair deal for the poor