All Intensive Purposes

As we all know, global warming leads to higher sea levels. But not on Lake Superior, which is as low as it has been for 81 years, thanks to drought and a warmer winter, which reduces ice coverage, allowing more water to evaporate. The manager of one marina says, "It seemed normal last October. Then it dropped and never came back."

Some people have their own theories about what's going on:

Many people living near Lake Superior don't buy drought or warm weather as the reasons for dropping water levels — a conspiracy theory is more popular. They say Lake Superior was drained through the St. Mary's River to raise the levels of Lake Huron and Lake Michigan.

The Army Corps says not.