10 rivers are responsible for 90% of the plastic in the ocean

So the article states that 8 are in Asia and 2 are in Africa, which isn't really wrong, but of those 8 in Asia, 7 are in China including the top 4 (mind the Indus only starts in Tibet, most of its course is in the Indian subcontinent).

You want to talk about next steps, action plans and remediation? Talk to China, first, India second, Egypt (and maybe Kenya and/or Tanzania for good measure) third and Nigeria fourth.

That leaves the Meghna which is mostly within Bangladesh and the Mekong which while having its headwaters in China, mostly drains the portion of southeast Asia between Vietnam and Thailand and the various countries on that peninsula have established the Mekong River Commission to maintain it.

Good luck.