A team of researchers with members from Princeton University, the University of Maine and Oregon State University has found that greenhouse gasses a million years ago, were only slightly higher than they were between 450,000 and 800,000 years ago. In their paper published in "Proceedings of the National Academy of Sciences," the team describes their study of the newly retrieved ice cores and how it is helping to better understand the changes to the Earth's ice ages.
A whiff of air frozen in ice for 1 million years provides a new snapshot of Earth's ancestral climate. "Gas bubbles are the gold standard for reconstructing climate," said lead study author John Higgins, a geochemist at Princeton University. (DOI:10.1073/pnas.1420232112)