The target of 5.4tCO2/person/year is assuming we take a linear path down from 2023 emissions to zero emissions in 2050. It is the halfway point on that line. R

The target of 5.4tCO2/person/year is assuming we take a linear path down from 2023 emissions to zero emissions in 2050. It is the halfway point on that line. Real world reductions (or increases) won't follow a linear path. Global population is also increasing. The number is just a rough estimate to show which countries are dropping the ball.