J. Renewable Sustainable Energy 4, 020401 (2012); https://doi.org/10.1063/1.3703693 4, 020401 © 2012 American Institute of Physics. Editorial: Time for green certification for all hydropower? Cite as: J. Renewable Sustainable Energy 4, 020401 (2012); https://doi.org/10.1063/1.3703693 Submitted: 19 March 2012 • Accepted: 29 March 2012 • Published Online: 10 April 2012 Z. Daniel Deng and Thomas J. Carlson ARTICLES YOU MAY BE INTERESTED IN Green small hydropower in China: Practices and drivers Journal of Renewable and Sustainable Energy 9, 024501 (2017); https:// doi.org/10.1063/1.4980157 Contributed Review: Source-localization algorithms and applications using time of arrival and time difference of arrival measurements Review of Scientific Instruments 87, 041502 (2016); https://doi.org/10.1063/1.4947001 Will the tradable green certifications and renewable portfolio standard policy work well in China: A recursive CGE analysis Journal of Renewable and Sustainable Energy 10, 055904 (2018); https:// doi.org/10.1063/1.5019756