So-called green taxes, which exact a price for the use of polluting or nonrenewable fuels, are having a positive effect on the environment and natural resource base of countries as varied as China, the Netherlands, and Hungary.
as varied as
as varied as are
as varied as those of
that are as varied as
that are varied as are
The phrase "as varied as" indicates some kind of comparison, so what are you comparing? What is it that is actually varying here? The noun 'countries" before the phrase and the three specific countries listed after the phrase. When you're comparing, you need the things you're comparing in parallel format.
So: "countries" on one side and "China, the Netherlands, and Hungary" on the other. Proper, parallel comparison.
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