You're not wrong, this headline is very poorly worded.
From the article:
>A recent study estimates that more than a quarter of all that waste could be pouring in from just 10 rivers, eight of them in Asia.
>The 10 rivers that carry 93 percent of that trash are the Yangtze, Yellow, Hai, Pearl, Amur, Mekong, Indus and Ganges Delta in Asia, and the Niger and Nile in Africa.
So to say "10 Rivers Contribute Most of the Plastic in the Oceans" is not really correct, they contribute something like 25%.
From the article:
>A recent study estimates that more than a quarter of all that waste could be pouring in from just 10 rivers, eight of them in Asia.
>The 10 rivers that carry 93 percent of that trash are the Yangtze, Yellow, Hai, Pearl, Amur, Mekong, Indus and Ganges Delta in Asia, and the Niger and Nile in Africa.
So to say "10 Rivers Contribute Most of the Plastic in the Oceans" is not really correct, they contribute something like 25%.