Why does ecology play a critical role in the modern world?

Ecology plays a very important role in the modern world. Ecology studies the interaction of organisms with the environment and with each other. For example, a person does not have a very good effect on the environment. Construction of factories, various stations, exhaust fumes, pollution and so on. But what a big role ecology plays in our life! Trees emit oxygen, and ecology also preserves the human habitat, living nature.