that drop in temperature came after what was described in the national geographic as 'six decades of abnormal warmth'."
that drop in temperature came after what was described in the national geographic as 'six decades of abnormal warmth'."
global warming:366
global warming
the period from 1983 to 2012 was likely the warmest 30-year period of the last 1400 years in the northern hemisphere, where such assessment is possible (medium confidence).