Rice, barley, dairy products, and leaf tobacco farming operates under high tariff and non-tariff barrier protection.

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Returning to the base months' later he found that there was more barrier protection and higher walls.

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The report said the existing barrier provides a greater degree of protection than originally anticipated.

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"There is no evidence whatsoever to suggest protection of the environment is a barrier to economic growth, but plenty to suggest smart regulation is actually a stimulus to growth, " he said.

BBC: Science & Environment