New Zealand has for years promoted itself around the world with the slogan "100% Pure New Zealand".

The country is often viewed as clean and green with lower levels of pollution and environmental degradation than in other parts of the world.

Stephen Sackur asked the New Zealand Prime Minister, John Key, whether his country's environmental standards have slipped?

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You can watch the full interview on BBC World News on Monday 9 May 2011 at 0330, 0830, 1530 and 2030 GMT and on BBC News Channel at 0430 BST and 2330 BST on Monday May 9.