Increasing the world population will increase the demand for new energy sources in the future. Waste generated as a result of agricultural activities can be considered as a sustainable energy source. Animal manure that occurs from livestock activities can be shown as an energy source if managed properly. Antalya province and its region, where agriculture and tourism are intense, have been chosen as the study area. In the study, taking into account the data of Turkey Statistical Institute in 2019, for cattle animal breeding the numbers of dairy and beef cattle; for ovine animal breeding the numbers of sheep and goats; for poultry, the numbers of laying hen, turkeys, geese and duck were evaluated. Manure amounts and potential biogas energy values were calculated considering the animal numbers of Antalya province in 2019. The amount of electricity and natural gas energy that can be obtained in this potential biogas energy is also calculated. The obtained results are compared with the relevant literature and calculations are made for the existing biogas potential. As a result of the research, it was calculated that the amount of manure that can be obtained from animal waste in Antalya province could be 3,821.86 million kg and the potential biogas energy could be 45.57 million MJ. It has been calculated that the total amount of biogas that can be obtained is equivalent to approximately 253.23 million kWh of electrical energy or 43.90 million m 3 of natural gas energy. As a result, considering the energy need of Antalya province, it can be said that an economic gain can be achieved by utilizing animal wastes for energy production.

Lakes are the most important freshwater resources for humans. It is stated that together with population growth, unplanned urbanization, excessive water consumption, industrialization, and unconscious irrigation, global climate change causes changes in the water levels and volumes of lakes. Lake Eğirdir in Turkey, which is important in terms of drinking and irrigation water use, was chosen as the study area. Lake Eğirdir water level (LWL) and water volume (LWV) values measured between 1988–2019 were used. Dependencies in the annual LWL and LWV were examined by autocorrelation analysis, and trend changes were examined by regression analysis, the Mann-Kendall rank correlation test, and the Şen innovation trend test. The research has shown a significant decrease since 2000 in LWL and since 1990 in LWV. The LWL has decreased by −1.272 to −3.514 m and the LWV has decreased by −72.980 to −1082.134 hm3 in approximately 32 years. The actions to be taken based on the values determined in this study will help protect the water resources of lakes. As a result of the tests used in our study, it was determined that there were decreases in both the water level and the volume of the lake. The climatic changes in the lake basin and the decrease in the water resources feeding the lake are shown as the biggest factor in these reductions.

The significance and effective use of water, one of the most basic requirements for sustaining vital activities, is gaining importance every day. Population growth and unprogrammed industrialization accelerate the consumption of available water resources. However, drought, as a result of climate change, poses a threat to water resources. Factors such as the exhaustibility of water resources, rapid population growth, unscheduled industrialization and drought increase the tendency towards alternative water resources. Rainwater harvesting is based on the principle of using the rainwater falling into the regions after it is stored. Water collected through rain harvesting can be utilized in many different areas, such as agricultural irrigation, landscape irrigation and domestic use. Among agricultural activities, the idea of water harvesting in greenhouse areas comes to the fore. Due to the gutters on the greenhouse roofs, water can be stored. In Antalya, which has about half of the greenhouses in Turkey, the amount of water in the rain harvest that can be obtained in greenhouses is 224,992,795.8 m3 per year. Monthly calculations throughout the year showed that the minimum water can be harvested in August (938,447.53 m3) and the maximum (54,771,210 m3) in December. Therefore, it is thought that some plant water consumption can be met by building sufficient storage in areas close to the greenhouse.

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