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 Shades of Ray Bradbury

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psychicbait
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PostPosted: Thu Sep 02, 2010 8:00 am Reply with quoteBack to top

Here´s a little mid-week inspiration from the beeb:


Charles Darwin's ecological experiment on Ascension isleBy Howard Falcon-Lang

Science reporter, BBC News


Cloud forest now forms a damp oasis on Ascension's highest peak 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 colonisation of Mars.

The tiny tropical island of Ascension is not easy to find. It is incredibly remote, located 1,600km (1,000 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.


Ascension is one of a number of volcanic islands in the South Atlantic 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.

But arriving on Ascension put an unexpected spring in Darwin's step.

Professor David Catling of the University of Washington, Seattle, is retracing Darwin's travels for a new book. He told the BBC: "Awaiting Darwin on Ascension was a letter from his Cambridge mentor, John Henslow.

"Darwin's voyage of discovery had already caused a huge sensation in London," he explained.

"Henslow assured him that on his return, he would take his place among the great men of science."

At this fantastic news, Darwin bounded forth in ecstasy, the sound of his geological hammer ringing from hill to hill.

Everywhere, bright red volcanic cones and rugged black lava signalled the violent forces that had wrought the island.

Yet, thinks Professor Catling, amid this wild desolation, Darwin began to hatch a plot.

Out of the ashes of the volcano, he would create a green oasis - a "Little England".

Island Eden

Darwin's great buddy was Joseph Hooker, the intrepid botanist and explorer.

Only a few years after Darwin's return, Hooker was off on his own adventures, an ambitious slingshot around Antarctica aboard HMS Erebus and Terror. Mirroring Darwin's voyage, Hooker called in on Ascension on the way home in 1843.

Ascension was a strategic base for the Royal Navy. Originally set up to keep a watchful eye on the exiled emperor Napoleon on nearby St Helena, it was a thriving waystation at the time of Hooker's visit.

However, the big problem that impeded further expansion of this imperial outpost was the supply of fresh water.


In his twenties, Charles Darwin explored the world aboard HMS Beagle Ascension was an arid island, buffeted by dry trade winds from southern Africa. Devoid of trees at the time of Darwin and Hooker's visits, the little rain that did fall quickly evaporated away.

Egged on by Darwin, in 1847 Hooker advised the Royal Navy to set in motion an elaborate plan. With the help of Kew Gardens - where Hooker's father was director - shipments of trees were to be sent to Ascension.

The idea was breathtakingly simple. Trees would capture more rain, reduce evaporation and create rich, loamy soils. The "cinder" would become a garden.

So, beginning in 1850 and continuing year after year, ships started to come. Each deposited a motley assortment of plants from botanical gardens in Europe, South Africa and Argentina.

Soon, on the highest peak at 859m (2,817ft), great changes were afoot. By the late 1870s, eucalyptus, Norfolk Island pine, bamboo, and banana had all run riot.

Back in England, Charles Darwin and his theory of evolution were busily uprooting the Garden of Eden.

But on a green hill far away, a new "island Eden" was being created.

Life on Mars

Yet could Darwin's secret garden have more far-reaching consequences?

Dr Dave Wilkinson is an ecologist at Liverpool John Moores University, who has written extensively about Ascension Island's strange ecosystem.

He first visited Ascension in 2003.

"I remember thinking, this is really weird," he told the BBC.

"There were all kinds of plants that don't belong together in nature, growing side by side. I only later found out about Darwin, Hooker and everything that had happened," he said.


Darwin's artificial forest captures moisture from clouds that drift over Ascension's peaks Dr Wilkinson describes the vegetation of "Green Mountain" - as the highest peak is now known - as a "cloud forest". The trees capture sea mist, creating a damp oasis amid the aridity.

However, this is a forest with a difference. It is totally artificial.

Such ecosystems normally develop over million of years through a slow process of co-evolution. By contrast, the Green Mountain cloud forest was cobbled together by the Royal Navy in a matter of decades.

Dr Wilkinson exclaimed: "This is really exciting!"

"What it tells us is that we can build a fully functioning ecosystem through a series of chance accidents or trial and error."

In effect, what Darwin, Hooker and the Royal Navy achieved was the world's first experiment in "terra-forming". They created a self-sustaining and self-reproducing ecosystem in order to make Ascension Island more habitable.

Wilkinson thinks that the principles that emerge from that experiment could be used to transform future colonies on Mars. In other words, rather than trying to improve an environment by force, the best approach might be to work with life to help it "find its own way".

However, to date, scientists have been deaf to the parable of Ascension Island.

"It's a terrible waste that no-one is studying it," remarked Wilkinson at the end of the interview.

Ascension Island's secret is safe for years to come, it seems.


http://www.bbc.co.uk/news/science-environment-11137903
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Slightlyoutofit
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PostPosted: Thu Sep 02, 2010 9:15 am Reply with quoteBack to top

It's one of those days for eco-news.

I just read about that dude who got shot at the Discovery Channel HQ.

http://www.bbc.co.uk/news/world-us-canada-11159256

Being the heartless bastard that I am, I thought "natural selection aided by a bullet". But then I went to his website (the BBC has a link to it) and read this:

Quote:
Saving the environment and the remaning species diversity of the planet is now your mindset. Nothing is more important than saving them. The Lions, Tigers, Giraffes, Elephants, Froggies, Turtles, Apes, Raccoons, Beetles, Ants, Sharks, Bears, and, of course, the Squirrels.


http://www.savetheplanetprotest.com/

I shall be wearing my black armband for the rest of the day.

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Dr Mike
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PostPosted: Thu Sep 02, 2010 9:25 am Reply with quoteBack to top

So what you are saying are that squirrel sympathizers are prone to violence.

Should we be worried?

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sunshine
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PostPosted: Thu Sep 02, 2010 12:42 pm Reply with quoteBack to top

Quote:
The humans? The planet does not need humans.


Well there's one less on the planet now Laughing

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Gold Hat
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PostPosted: Thu Sep 02, 2010 3:22 pm Reply with quoteBack to top

...


Last edited by Gold Hat on Thu Oct 14, 2010 3:32 am; edited 1 time in total
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pi_eyed
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PostPosted: Sun Sep 05, 2010 12:59 pm Reply with quoteBack to top

How about his own book.

"The voyage of the Beagle"

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