Ecological benefits of a healthy environmental and economic value of ecosystem services

Define the ecological benefits of a healthy environment and explain the factors you would consider when calculating the economic value of these ecosystem services. Can you calculate the value? What considerations do you need to make?
You may pick a country and/or an environmental resource to use in your example.

NOTE: Open to using any given ecosystem service, but one I found interesting was the economic value of trees, see this article here for reference:

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