136438document5088416-02 Carbon negative emissions - Revised manuscript.pdfapplication/pdfbfae8ed710e9ec405b5bf13dbbc0e502MD59591312016-04-20 09:38:22https://pure.iiasa.ac.at/id/eprint/12713/1/16-02%20Carbon%20negative%20emissions%20-%20Revised%20manuscript.pdf