Critical thinking, which involves higher order thinking activities (HOTS), is an important skill that has been widely discussed in the last two decades. This study aims to determine the profile of high school students' critical thinking skills on climate change and waste recycling. It is a quantitative descriptive study using an instrument developed based on indicators of critical thinking skills developed by Ennis in 1985, namely providing simple explanations, building basic skills, concluding, providing further explanations, and setting strategies and tactics. The study participants were 102 senior high school students in Pontianak Indonesia who were selected through the purposive sampling technique. The results show that the critical thinking abilities related to each indicator had highest scores of two aspects that is basic skills and drawing conclusions. The simple explanation indicator scored 59.42%; that of building basic skills 71.37%; that related to drawing conclusions 67.62%; the explanation indicator 42.44%; and the setting strategy and tactics indicators 66.87%. The conclusion is that students' critical thinking skills are only sufficient to poor category. 

Critical Thinking; Profile; Research and Development (R&D)

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