The handling of waste plastics is a big challenge and various recycling routes are imposed to prevent the environmental ecosystem. Waste plastics are one of the major pollutants in the living environment and have characteristics such as non‐dehydration and toxicity. The wastages are occupying natural lands and water source areas, decreasing the soil behavior, reducing the minerals, and affecting the environmental ecosystem. In this situation, waste plastics are effectively handled with a suitable recycling process that helps to minimize toxicity. According to the present research, waste plastics are handled by separate arrangements and treated with the pyrolysis technique to obtain useful alternative fuel oil for automotive fuel applications. The synthesized pyrolysis (waste plastic oil fuel) oil fuel is tested by single stage four‐stroke diesel engines and its performance is compared with standard diesel fuel. The test results show that the brake thermal efficiency is improved by 28.85%. A higher 37% yield was obtained during this decomposition process above the 550°C temperature of 1 kg of waste plastics, formed as gas and condensed via cooling water, maintaining an ambient temperature. Moreover, the DI gas emission analyzer is used to evaluate the exhaust gas emission result found less than 1% of the CO and HC formation.

Nowadays, the environmental ecosystem is protected and maintains sustainability for waste material management like agriculture product end waste and industrial waste. The main scope of this research is to gather the agriculture end product of melon shell ash waste and industrial fly ash waste utilized as organic reinforcements for making a lightweight with superior strength green hybrid composite for fourth‐generation terrestrial ecosystem applications. The various volume percentage of waste melon shell ash and fly ash are governed by the ratio of 0:0, 1:4, 2:4, 3:4, and 4:4, respectively. The green aluminum alloy (Al6061) hybrid composite is synthesized via a semi‐solid stir technique. The developed green hybrid composites are subjected to physical and mechanical studies followed by ASTM standards. The developed composite contained a 4:4 ratio of melon and fly ash and found a light weight of 2.75 ± 0.11 g/cc with improved tensile strength and hardness percentages of 8.35% and 21.38% compared to cast aluminum alloy. This research may help basic knowledge for future investigations on modern green composite manufacturing via agricultural and industrial wastage.