Evaluation of Green Open Space Needs Based on Oxygen Requirements: Implementation of the 13th Goal of The SDGs 2030 Rahma Musyawarah, Mutmainnah Mutmainnah, Nurul Ilmi Rasjusti Jurnal Penelitian Pendidikan Geografi Vol. 10 No. 2 2025 DOI 10.36709/jppg.v10i2.421