RT Journal Article SR Electronic T1 Beyond COP 21: Potential and challenges of the “4 per Thousand” initiative JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 20A OP 25A DO 10.2489/jswc.71.1.20A VO 71 IS 1 A1 Rattan Lal YR 2016 UL http://www.jswconline.org/content/71/1/20A.abstract AB