How is that relevant? Serious question, I don’t see a link between forests and per capita that actually matters. If we were talking about economic comparisons, sure. If anything, adjusting it as “per sq mile of forestable land” would make more sense.
It's relevant because, as demonstrated multiple times in this thread, when the topic of pollution and emissions from China comes up everyone rushes to defend them with "but muh per capita". As if the environment cares.