Eleven of the 12 years between 1995 and 2006 ranked among the 12 warmest years since 1850, and since 1993 the global sea level has risen by an annual rate of 3.1 mm.

The average temperature in the Northern Hemisphere in the second half of the 20th century was probably the highest in the past 1,300 years.

Detailed by the Intergovernmental Panel on Climate Change, these global warming events were all believed caused by excessive greenhouse gas emissions.