image: This is a schematic of the influence of oxygen concentrations on global climate. This material relates to a paper that appeared in the June 12, 2015 2015 issue of Science, published by AAAS. The paper, by C.J. Poulsen at University of Michigan in Ann Arbor, MI, and colleagues was titled, "Long-term climate forcing by atmospheric oxygen concentrations." view more
Credit: [Credit: Chris Poulsen, University of Michigan]