Another bad effect of global warming

One of the world's great oceanic mass migrations is threatened by global warming (like a lot of other things in the waning natural world):

Warmer ocean brings fewer fish in SAfrica's sardine run: scientist

"In winter, when the ocean's temperature dips below 20 degrees (68 Fahrenheit), millions of sardines travel 2,000 kilometres (1,250 miles) along the coast up as far as the port city of Durban.

"The temperature along the KwaZulu-Natal coast is rising just above what sardines can tolerate," O'Donoghue told AFP.

"We are really at the limit. If the temperature gets warmer with the global warming... sardines are unlikely to come as far up the coast," he said.

That just makes me upset.