What is entropy? how is it related to the environment? also, what is the increase of entropy principle? brief answer (not too lengthy and not too short)

1). Entropy can be defined as a measure of sytem's thermal energy per unit temperature unavailable for ding useful work.

In other words, we can say that its a measure of the degree of randomness of a defined system.

Entropy-Environment relation:

Entropy is the fundamental concept that applies to the environment, humans or the entire universe.

The Second law  of thermodynamics explains the environmental impact of entropy. Reversing a process requires work, so reversing environmental process takes energy. Environmental impacts are higher at higher entropies and harder to reverse. Entropic flows and entropy measures can be used to prioritize the impacts which need action.

Increase of Entropy Principle:

This principle states that the total change in entropy of a system with its enclosed adiabatic surrounding is always positive i.e., greater than or equal to zero.

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