A disturbance in the polar vortex could spill icy cold air south into the United States much earlier than usual, the National ...

Climate scientists have long watched the jet stream with fascination and growing concern. These rivers of air racing across ...

While Venezuela's military resistance may not last long, instability risks long-term insurgency by loyalists, militias and ...

When polar ice sheets melt, the effects ripple across the world. The melting ice raises average global sea level, alters ...