Something has gone wrong with the colours. There's only 3 colours instead of the spectrum the key suggests. 97th rank is the same shade as the 4th rank.

Yeah. I think this research topic is still far from being settled. Just 5 years ago the understanding was that 10 rivers contributed almost all riverine plastic into the ocean but now the data is wildly different. It needs more research. My gut feeling is that Indonesia and China for example are underestimated.

Maybe it's just me but I think when using 2d shapes, the area of the shape is more intuitive at communicating the data than the diameter/length. Here a country with 5 times more output look like it's 25 times more by area.

Interesting stuff though, thanks!