Natural Climate Patterns

From the strongest typhoon ever observed to historically high atmospheric carbon dioxide levels, the State of the Climate in 2013 report provides a complete rundown on the state of Earth's climate and how it is changing.

October 2011

  • In the mid-1980s, the winter sea ice pack in the Arctic was dominated by multi-year ice—ice that had survived at least one summer melt. Today, less than half of the sea ice at winter maximum has survived at least one summer.