Observed changes in the atmosphere
Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850. In the Northern Hemisphere, 1983–2012 was likely the warmest 30-year period of the last 1400 years (medium confidence).
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Anthropogenic Climate Change »Anthropogenic Climate Change
Is the Earth's climate changing? »Is the Earth's climate changing?
Warming of the climate system is unequivocal »Warming of the climate system is unequivocal
Observed changes in the climate system »Observed changes in the climate system
Observed changes in the atmosphere
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