220018document79681PNAS-2017-Scovronick-1618308114.pdfapplication/pdf661499f086cd8ebb95c0383ad982c31eMD519943292017-10-31 08:48:44https://pure.iiasa.ac.at/id/eprint/14915/1/PNAS-2017-Scovronick-1618308114.pdf