For nearly 30 years, Sandy Lam (pictured below) has been rising early each day for a dip in the sometimes choppy waters off the western edge of Hong Kong island, next to one of the world's busiest ports.
"I feel there is more plastic in the sea," said Dennis Yeung, 58. "I have noticed a difference since I've been swimming here from when I was small... There is quite a big difference. In the future, it will be more of a problem too."