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 best way to process "as varied as" here is as an IDIOMATIC EXPRESSION.
here's a valid way to think about it: you can substitute "including" for "as varied as"; the sentence should still work.
these two don't have exactly the same meaning - i.e., "including" isn't the SAME as "as varied as" - but, if one of them is grammatically ok, then so is the other.
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