Man Made Foam Phenomenon
A 50 foot river of foam runs through China's Guangdong province. Officials say it is caused by a chemical deodorant from a household rubbish tipped into the river. The foam is said to be harmless.
Do you trust China's officials?
Natural Foam Phenomenon
In Scotland, seawater and sand mixed to make foam that invaded the shores. I do not need an official to tell me seawater and sand is harmless.