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Since September 2009, three British campaigners have travelled more than 28 000 miles, and through 21 countries, to raise awareness of the effects of rising sea levels.

Their expedition is called Atlantic Rising, and they have been keeping in touch with Outlook with updates on their journey.

The latest of their reports comes from the Orinoco Delta in Venezuela.

Expedition member Will Lorimer went to visit a woman who runs a remote tourist lodge in the Delta and who supplies medicines to the indigenous Warao indians.