Environmental sources refer to natural elements and processes that contribute to the ecosystem. These sources include air, water, soil, and sunlight, which are essential for sustaining life. They provide habitats for various species and are crucial for the growth of plants, which in turn support animal life. Additionally, environmental sources encompass renewable resources like wind, solar energy, and hydropower. These resources can be harnessed for energy without depleting the Earth's natural systems. Understanding and managing these sources is vital for promoting sustainability and protecting the environment for future generations.