warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia.
warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia.
intergovernmental panel on climate change:187
conclusions of ar5 are summarized below: working group i "warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia".