Why All the Extreme Weather?

Everybody knows about the winter weather — closing airports in Europe, collapsing the Metrodome roof in Minneapolis, and tying up much of the eastern United States. It's even unusually cold in Siberia. During the warmest decade on record, the Eastern US, Northern Europe and East Asia are experiencing their coldest and snowiest winters in 100 years. So what about global warming? Gavin Schmidt is a climate scientist at the NASA Goddard Institute for Space Studies.