Global warming: Worrying lessons from the past

(Université de Genève) Fifty-six million years ago, the Earth experienced an exceptional episode of global warming. Within 10,000 to 20,000 years, the average temperature increased by 5 to 8 degrees. Based on the analysis of sediments from the southern slope of the Pyrenees, researchers from the University of Geneva found that the amplitude of floods increased by a factor of 8 up to 14, and vegetated landscapes were replaced by arid pebbly plains.