If there is a nature park in the vicinity of the industrial park, not only will the types of industry be limited (heavy polluting industries would not be permitted), the county government could even demand that operators pay fines or close factories if the birds fail to come back because of pollution.
而工業區附近有自然公園，不僅工業型態被限制，重汙染工業進不來；縣政府還可要求業者，若鳥類因汙染去而不返，將會受罰或必需關廠。