image: A semi-arid region of Western Australia. This material relates to a paper that appeared in the May 22, 2015, issue of Science, published by AAAS. The paper, by Anders Ahlström at Lund University in Lund, Sweden, and colleagues was titled, "The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink." view more
Credit: [Credit: Luciana Porfirio]