Climate change is defined as a statistically significant variation in either the mean state of the climate or in its variability, persisting for an extended period -- typically decades or longer ...

The degree to which the climate warms in the future will depend on natural climate variability and the level of greenhouse gas emissions. If greenhouse gas emissions continue then average global ...

The interaction between the polar vortex and regional weather patterns is complex, but it highlights the dynamic and sometimes paradoxical nature of climate variability. Both heatwaves and cold ...