Penelitian ini bertujuan untuk menghasilkan buku ajar berbasis Science, Environment, Technology and Society (SETS) pada materi Perubahan Lingkungan dan Daur Ulang Limbah yang layak secara teoritis berdasarkan dari segi isi, penyajian, bahasa dan kesesuaian dengan pendekatan Science, Environment, Technology and Society (SETS) serta layak secara empiris berdasarkan keterbacaan, respon siswa dan keterampilan berpikir kritis. Jenis penelitian ini adalah pengembangan dengan menggunakan metode 4D (define, design, develop, dan disseminate) namun hanya dilakukan sampai tahap develop. Parameter yang diukur adalah kelayakan teoritis ditentukan berdasarkan hasil validasi buku ajar, serta kelayakan empiris berdasarkan keterbacaan buku ajar, respon siswa dan keterampilan berpikir kritis. Penelitian ini dilakukan di Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Surabaya. Penelitian dilakukan selama semester genap tahun pelajaran 2018/2019. Buku ajar yang telah dikembangkan diujicobakan secara terbatas pada 15 siswa kelas X SMA Negeri 2 Sidoarjo pada Februari 2019. Data yang diperoleh dianalisis secara deskriptif kuantitatif. Hasil validitas buku ajar oleh tiga pakar mendapatkan skor rata-rata keseluruhan 3,73 dengan kategori sangat valid, keterbacaan menunjukkan bahwa buku ajar yang dikembangkan mencapai keterbacaan pada level 10 artinya sesuai digunakan untuk kelas X SMA, respon siswa menunjukkan presentase 99,3% sehingga termasuk kategori sangat positif.

Kata kunci : Pengembangan, Pedekatan Science, Environment, Technology and Society (SETS), Perubahan Lingkungan dan Daur Ulang Limbah, Keterampilan Berpikir Kritis.

This research aims to produce textbook based on Science, Environment, Technology and Society (SETS) material of Environment Change and Waste Recycling that is feasible theoretically based on content, presentation, language and conformity with Science, Environment, Technology and Society (SETS) and empirically eligible based on textbook readability, students responses and critical thinking skills. The type of this research is development by using 4D method (define, design, develop, and disseminate), but in this research the step only until develop step. The parameters measured are the theoretical feasibility determined based on the validation of textbooks, and empirical feasibility determined based on the textbook readability, student responses and critical thinking skills. This research is held in Department of Biology, Faculty of Mathematic and Science, State University of Surabaya. The research was conducted during the even semester of the academic year 2018/2019. Textbooks that have been developed are limited to 15 senior high school students of SMAN 2 Sidoarjo in February 2019. Data were analyzed descriptively quantitative. The result of the research on the validity of the textbook shows the score of 3.73 with the category is very valid, the readability test show that the developed textbooks achieve legibility at level 10 which means appropriate for the X grade of high school, student responses show a percentage of 99,3% so it belongs to very positive category.

Keywords : Development, Science, Environment, Technology and Society Approach, Environmental changes and waste recycling, Critical Thinking Skills.