By HOWARD FALCON-LANG - BBC
Updated: Wed, 01 Sep 2010 15:16:20 UTC

Thanks to Serendipitydawg for the link.

A lonely island in the middle of the South Atlantic conceals Charles Darwin's best-kept secret. Two hundred years ago, Ascension Island was a barren volcanic edifice.

Today, its peaks are covered by lush tropical "cloud forest".

What happened in the interim is the amazing story of how the architect of evolution, Kew Gardens and the Royal Navy conspired to build a fully functioning, but totally artificial ecosystem.

By a bizarre twist, this great imperial experiment may hold the key to the future colonization of Mars.

The tiny tropical island of Ascension isn't easy it find. It is marooned in the ocean, 1,600km (1000 miles) from the coast of Africa and 2,250km (1,400 miles) from South America.

Its existence depends entirely on what geologists call the mid-Atlantic ridge. This is a chain of underwater volcanoes formed as the ocean is wrenched apart.

However, because Ascension occupies a "hot spot" on the ridge, its volcano is especially active. A million years ago, molten magma explosively burst above the waves.

A new island was born.

Back in 1836, the young Charles Darwin was coming to the end of his five-year mission to explore strange new worlds and boldly go where no naturalist had gone before.

Aboard HMS Beagle, he called in at Ascension. En route from another remote volcanic island, St Helena, Darwin wasn't expecting much.

"We know we live on a rock, but the poor people of Ascension live on a cinder," the residents of St Helena had joked before his departure.
... continue reading

TAGGED: DARWIN, EVOLUTION