The term 'environmental topic' can be summarized by the word 'NATURE'. NATURE is a broad term that encompasses all of the living and non-living things in the environment, including plants, animals, air, water, soil, and other natural resources. It also includes the relationships between these elements and how they interact with each other. NATURE is an important part of our lives, as it provides us with food, shelter, and other resources. It is also essential for maintaining a healthy environment and preserving biodiversity.