oxygène (1) histoire (1) réchauffement mondial (1) fossile (1) froid (1) climat (1) History (1) Antiquities, Prehistoric (1) Global warming (1) Solar radiation (1) Shells (1) Oxygen (1) Prehistoric peoples (1) Isotopes (1) History (1) Comprehension (1) Cold (1) Climatology (1) Climate (1) Addition (1) Climate (1) Isotopes (1)