Global warming in the industrial age is “unprecedented” in the past 2,000 years, with human activity “unparalleled” in its impact on absolute temperatures, according to a study published in Nature. It found no evidence of globally coherent cold and warm periods in the pre-industrial era, when the lowest temperatures were found in sporadic locations during the fifteenth, seventeenth and mid-nineteenth centuries. Science 314, 1740–1745 (2006). The study, led by Dr David Vaughan from Imperial College London, used data from ice cores drilled into Antarctica that show how carbon dioxide levels have changed over time.
Global warming in the industrial age is “unprecedented” in the past 2,000 years, with human activity “unparalleled” in its impact on absolute temperatures, according to a study published in Nature. It found no evidence of globally coherent cold and warm periods in the pre-industrial era, when the lowest temperatures were found in sporadic locations during the fifteenth, seventeenth and mid-nineteenth centuries. The study, led by Dr David Vaughan from Imperial College London, used data from ice cores drilled into Antarctica that show how carbon dioxide levels have changed over time.