This isn't the Yangtse River in China, it's a river in Colorado that has been fouled with waste runoff from an abandoned mine.
I admire that "can-do" American spirit of these kayakers. Who cares that this river has been so befouled as to appear as a rotten stream of industrial waste?
What could possibly go wrong with having contact with this river, so brightly colored yellow?
I bet the fish are having a great time in the water too! Fun for all!