A(n) is best defined as one who considers the impacts on the whole ecosystem, both the living and nonliving, when considering an action.

The answer is an ecocentrist.

Explanation:

Ecocentrism refers to a term that is usually utilized in ecological political philosophy to refer to a system of values related to nature-centered instead of human-centered.

Ecocentrism is based on an ontological belief. This belief does not accept any existential divisions regarding nature's aspects in human and non-human. This belief tries to prove that humans are not the only people that have  intrinsic value or that they have a major intrinsic value regarding non-human nature.  

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