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It is not abs. It is a ratio of emitted CO2 and the population of the country. Larger radius of the circle worse. In China population remained rougly same in 1990 and 2010, but GDP per capita increased 4 times, so they ended up with rougly 2.5 times more CO2 emitted.
This is wrong. The horizontal axis is CO2 per population. The size of the circle is total emissions, not normalized by population.
Exactly. But you need both axis to understand what happens. The change in population, emitted, carbon and increase in GDP. Horizontal axis shows that China per capita emits much more 2010, larger circle, than in 1990. But why? Population is roughly the same.
But emitted CO2 per GDP decreases, vertical. What happens? GDP in China increased 4 times from 1990-2010, but emission did not that much. Yet this results reproduces in increased emission per capita, size of circle. Complicated graph.
For the size of circle clearly stands CO2/population. Sign / means division and population means total population, at least where I am from.
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