In eastern Tennessee a portrait of Earth's progression from ice age to present is taking shape. Each day, up to 100 years of climatic history unfolds. By early this year, the story will be complete, thanks to some five million processing hours on supercomputers at the Oak Ridge National Laboratory.

Even if the onslaught paled next to great winter outbreaks of the past, it was impressively persistent across some influential areas, including southeast England and the U.S. mid-Atlantic.

Years before Congress began debating greenhouse-gas reduction, more than 500 U.S. cities had pledged to reduce their carbon footprints in line with the goals of the Kyoto Protocol. Now American cities are leading the way on adapting to climate change.

Policymakers should focus on what needs to be achieved in the next 40 years in order to keep long-term options viable for avoiding dangerous levels of warming, a new study concludes.

In a vivid example of how a small geographic feature can have far-reaching impacts on climate, new research shows that water levels in the Bering Strait helped drive global climate patterns during ice age episodes dating back more than 100,000 years.