Ok so if we slice China in half with a border, we have halved their total emissions. If we add another line we can quarter their emissions. I'm sure the reefs feel much better about accounting based on totals.

Or, put, another way, anthropogenic global warming, and ocean acidification, is caused by the totality of human activity.

All AGW divided by total human population equals one.

So, naturally, The Great Barrier Reef is very concerned with totals.

It's beside the point but

https://en.m.wikipedia.org/wiki/Heihe%E2%80%93Tengchong_Line

True. So western countries that have extremely high per capita numbers need to reduce their emissions by consuming less and supporting renewable tech research.

https://www.gapminder.org/tools/#$model$markers$line$data$fi...