Reuters: A team of scientists studying rock samples in Africa has shown a strong link between falling carbon dioxide levels and the formation of Antarctic ice sheets 34 million years ago. The results are the first to make the link, underpinning computer climate models that predict both the creation of ice sheets when CO2 levels fall and the melting of ice caps when CO2 levels rise. The team, from Cardiff, Bristol and Texas A&M Universities, spent weeks in the African bush in …