An expert on environmental travel is urging tourists to choose their tours wisely if the want to help protect endangered sites.

Alonzo Addison, author of the new Disappearing World: 101 of the Earth's Most Extraordinary and Endangered Places, says that travellers should be "selective about choosing trips, or get involved with trips that help clean up or care for these sites".

Speaking to the Miami Herald, the writer explained that places such as Cambodia are now extremely popular with tourists, particularly since a number of heritage sites have been opened up.

But he added that tourists must recognise the rarity of such locations and ensure they act responsibly in choosing an environmental tour of them.

Mr Addison's book outlines a number of places which are popular with visitors but are also threatened by external forces such as development or agriculture.

He said of his work: "I hope it raises awareness, to make people understand the beauty and all the wonders we have that need our joint efforts to make sure they last for the next generation."

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