Putri, P. D.; Tukiran, T.; Nasrudin, H. THE EFFECTIVENESS OF PROBLEM-BASED LEARNING (PBL) MODELS BASED ON SOCIO-SCIENTIFIC ISSUES (SSI) TO IMPROVE THE ABILITY OF SCIENCE LITERACY ON CLIMATE CHANGE MATERIALS. J. penelitian. pendidik. sains 2018, 7, 1519-1524.