The increase in population causes an effect on increasing CO2 production, especially from the household energy sector. The increase in the concentration of CO2 in the atmosphere is the main trigger for climate change and the effects of greenhouse gases. Indications of the occurrence of this phenomenon can be seen from the increase in air temperature and the formation of an urban heat island in Kendari City in the last 10 years. This study aims to determine the amount of CO₂ emissions from household activities and the absorption of CO2 gas from tree species in Pondambea Village, Kadia District, Kendari City. The method used is a quantitative technique to calculate primary and secondary CO2 emissions. The results show that the total CO2 emission in Pondambea Village is 424.22 tons/month. Meanwhile, the carbon absorption capacity of tree species in Pondambea Village is 421.15 tons/month, so that the remaining carbon emissions are 3.07 tons/month. Therefore, to maintain emission absorption and create zero emission in Pondambea Village, this study recommends maintaining the number of existing trees and adding at least 6 glodokan pole trees or at least 5 king palm trees

LST and NDVI analysis in Das Wanggu utilizes Landsat 9 satellite remote sensing. LST calculations usde thermal band 10 and NDVI used Red band (Band 4) and InfraRed Band (Band 5). There are 5 LST classes, 17.25 oC -19.66 oC with an area of 908.16 Ha, 19.66 0C-22.08 oC covering 6973.71 Ha, 22.08 oC -24.49 oC covering 21748.26 Ha, 24.49 oC -26.90 oC covering an area of 4235.37 Ha, and 26.90 oC -29.31 oC with a wide coverage of 81.18 Ha, while NDVI values obtained 3 classes namely NDVI <0.2 of 1783.643 Ha, NDVI with a range of 0.2 – 0.5 covering an area of 28617.74 Ha, and areas with NDVI > 0.5 covering an area of 3544.87 Ha. The amount of LST is highly dependent on the type of land cover and land use. NDVI indicates the presence of vegetation in the study area. A negative relationship was found between LST and NDVI in Das Wanggu with a Correlation Coefficient of -0.179.

One of the priority watersheds in Southeast Sulawesi is the Poleang watershed. It is necessary to assess management performance to remain sustainable in its implementation. This research aims to determine the performance of poleang watershed management based on indicators of land conditions and determine recommendations for the direction of sustainable land management policies. The survey methods used in the research and analysis include land criticality, land cover and erosion in calculating carrying capacity. This research resulted in the fact that the land support in the Polean g watershed had a high class with a score of 1.25 based on the critical land sub-criteria. Sub-land cover criteria have an excellent category with a score of 0.5, and the erosion index sub-criterion has a very high category with a score of 1.5. Overall, the carrying capacity of the Poleang watershed is in the moderate category, so it is necessary to maintain land or increase the area of vegetation cover of the Poleang watershed through the application of vegetation conservation methods, technical conservation methods and mechanical conservation methods.

Urban heat island (UHI) merupakan kecenderungan pusat kota memiliki suhu permukaan lebih hangat dibandingkan pinggiran kota atau pedesaan. Berdasarkan data peningkatan jumlah penduduk dan ekspansi ruang terbangun yang tidak terkendali di Kota Kendari, ada dugaan telah terjadi fenomena UHI. Penelitian ini bertujuan untuk mengidentifikasi UHI Kota Kendari periode tahun 2001 dan 2019. Metode penelitian yang digunakan adalah analisis brightness temperature,(BT) yaitu mengekstrak nilai Citra sehingga mempoleh nilai suhu dalam satuan celsius, kemudian menentukan besar emisivitas permukaan sehingga diperoleh nilai land surface temperatur (LST). Nilai LST yang diperoleh kemudian digunakan untuk menganalisis UHI treshold dan UHI index. Jika nilai rerata LST lebih besar dari UHI tresholdnya maka wilayah yang dimaksud mengalami UHI, dinyatakan dengan nilai positif pada UHI index dan bernilai > 3 o C. Hasil penelitian menggunakan citra Satelit tahun 2001 menunjukkan rentang nilai LST wilayah Kota Kendari yaitu 19,099 o C hingga 34,459 o C. Berdasarkan nilai LST ini, diperoleh UHI treshold sebesar 25,95 0 C, Berdasarkan nilai tersebut, diperoleh UHI index yang bernilai positif dan lebih besar dari 3 o C pada beberapa wilayah, sehingga pada tahun 2001 wilayah Kota Kendari telah mengalami fenomena UHI dengan wilayah paparan sebesar 1,021% dari total luas wilayah. Sedangkan pada tahun 2019, menunjukkan rentang nilai LST Kota Kendari yaitu 14,27 0 C hingga 35,426 0 C, dengan UHI treshold sebesar 24,6 o C. Berdasarkan UHI treshold ini, diperoleh UHI index bernilai positif dan lebih besar dari 3 o C pada sebagian wilayah Kota Kendari, sehingga ditemukan pada tahun 2019 telah terjadi fenomena UHI dengan wilayah paparan yang lebih luas yakni 18,92% dari luas wilayah.

The rise of illegal or unlicensed sand mining by irresponsible individuals has caused damage along the coast of Mawasangka District, Central Buton Regency. This study aims to identify the biophysical environmental impacts due to illegal sand mining in the coastal District of Mawasangka Buton and recommendations for post-sand mining land management. The method used in this study was direct observation to determine changes in the coastline and types of damaged vegetation, normalized difference vegetation index (NDVI) analysis to determine the density of vegetation on post-mining land, and measuring the depth of excavation. The results showed that there had been 321 m of beach abrasion and the types of vegetation damaged were coconut, acacisa and jaran wood trees. The results of the NDVI analysis show that non-green space around the mining area is 33.63 ha, while very low vegetation density is 41.91 ha, and low vegetation is 330.05 ha, while the rest is moderate and high vegetation covering 605.47 ha. Measurement of the depth of excavation ranged from 0.6 m – 2.3 m with good and moderate categories. Management of coastal post-mining land in the Mawasangkan sub-district is directed as pond land and revegetation.