Author Retains CopyrightShannon, Philip John.2018-07-312021-11-232018-07-312021-11-2319941994https://ir.wgtn.ac.nz/handle/123456789/16389pdfen-NZhttps://www.wgtn.ac.nz/library/about-us/policies-and-strategies/copyright-for-the-researcharchiveGeneral Agreement on Tariffs and Trade (Organization)Free trade--Environmental aspects.International economic relations--Environmental aspects.Text2021-11-23All rights, except those explicitly waived, are held by the Author