How would you persuade someone who believes that ecological services are unmeasurable and provide no value to human society that they are, in fact, valuable?

The ecological services provided by conservation areas are diverse and sometimes not easily understood or appreciated by the general public, who may desire quantifiable, economic measures of their value. How would you persuade someone who believes that ecological services are unmeasurable and provide no value to human society that they are, in fact, valuable? For inspiration, check out this video on ecosystem services featuring the late E.O. Wilson, who, as you remember from Unit V, was a coauthor of the theory of island biogeography.
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