Unusually cold winters aren't just happening in Europe and in Mexico, where snow is almost never seen at all. This is part of a cold spell in Mexico this winter that has killed off 10% of the 100 million Monarch butterflies that are spending the winter there, before migrating back to the U.S. and Canada in the summer.

The butterflies have been frozen to branches by the icy winds. However, this is not their worst winter. Marco Hernandez, director of the Biosphere Reserve, where the Monarchs spend the winter, says, "In 2002, with (6 inches) of snow, we were walking on thick carpets of dead butterflies."

Global warming, which actually leads to colder winters in some places and more extreme weather worldwide, may eventually end the ancient cycle of the migrating Monarchs.

Tony's Note: You'll see lots of stories about Global Warming on my site. I am not of the opinion that Global Warming is occurring due to human influence. Rather, I think it has more to do with the sun going through changes, and natural cycles of the Earth through ice ages and desertification epochs.