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At 50,000 square miles the Pantanal is the world's largest remaining wetland and stretches across parts of Brazil Bolivia and Paraguay. It is under threat from a plan to make 1800 miles of it navigable, putting the diverse ecology at risk.

Also on the programme the sinking of Shell's Brent Spar oil platform and how Yellowstone Park is recovering from forest fire in 1988.

Presented by Julian Coleman.