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Published online 26 November 2004 | Nature | doi:10.1038/news041122-15
Corrected online: 1 December 2004

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Scientists propose conservation parks on Mars

International agreement could preserve important sites.

Next time you go for a stroll on Mars, be sure you don't leave any litter behind. A plan to keep parts of the red planet in their pristine state could see seven areas turned into 'planetary parks', regulated just like national parks here on Earth.

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