What is Green Manufacturing? A Quantitative Literature Review Ira Setyaningsih, Wakhid Slamet Ciptono, Nurul Indarti and Nofie Iman Vidya Kemal E3S Web Conf., 120 (2019) 01001 Published online: 27 September 2019 DOI: 10.1051/e3sconf/201912001001