Here's why:

* Air, water, and land: These are the fundamental components of the environment that organisms live in.

* Surrounding an organism or community: Ecology studies the interactions between organisms and their environment, whether it's a single individual or a whole ecosystem.

* From a small area to Earth's entire biosphere: Ecology encompasses a wide range of scales, from the microscopic level to the global level.

* Includes impact humans on environment: Humans are a major factor in shaping the environment, and ecology studies the impact of human activities on ecosystems.

In essence, ecology is the study of how organisms interact with each other and their surroundings. It's a vast and complex field that helps us understand the intricate web of life on Earth and the challenges we face in preserving it.