Study measures Atlantic plastic accumulation

A study has measured the amount of plastic debris found in a region of the Atlantic Ocean over a 22-year period.

US researchers, writing in Science, suggest the volume of plastic appeared to have peaked in recent years.

One reason could be tighter marine pollution rules that prevent vessels dumping their waste at sea.

The team said monitoring the free-floating plastic also provided an insight into the behaviour of ocean surface currents.

They found plastic, most pieces measuring no more than a few millimetres, in more than 60% of 6,136 samples collected by dragging fine-meshed nets along the ocean's surface.

The researchers - from the US-based Sea Education Association (Sea), Woods Hole Oceanographic Institution and the University of Hawaii - described plastic as a "major contaminant".

"Their chemically engineered durability and slow rate of biodegradation allow these synthetic polymers to withstand the ocean environment for years to decades or longer."

The impacts caused by the debris include:

• sea animals becoming entangled
• seabirds and other marine creatures eating the plastic
• the debris being used as a "life raft" by some species to reach areas outside their normal distribution range

"While high concentrations of floating plastic debris have been found in the Pacific Ocean, only limited data exist to quantify and explain the geographical range," they said.

"In the Atlantic Ocean, the subject has been all but ignored."

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Plankton decline across oceans as waters warm

The amount of phytoplankton - tiny marine plants - in the top layers of the oceans has declined markedly over the last century, research suggests.

Writing in the journal Nature, scientists say the decline appears to be linked to rising water temperatures.

They made their finding by looking at records of the transparency of sea water, which is affected by the plants.

The decline - about 1% per year - could be ecologically significant as plankton sit at the base of marine food chains.

This is the first study to attempt a comprehensive global look at plankton changes over such a long time scale.

"What we think is happening is that the oceans are becoming more stratified as the water warms," said research leader Daniel Boyce from Dalhousie University in Halifax, Nova Scotia, Canada.

"The plants need sunlight from above and nutrients from below; and as it becomes more stratified, that limits the availability of nutrients," he told BBC News.

Phytoplankton are typically eaten by zooplankton - tiny marine animals - which themselves are prey for small fish and other animals.

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A history of mass extinctions on Earth

During long history of planet Earth, massive extinctions and violent climate changes are the norm. We've created this infographic to help you chart the rise and fall and rise of life on Earth over the past few billion years.

Humans may have evolved during an unusual period of relative climate stability (despite those ice ages). What you see here are the biggest mass extinctions in Earth history and their places in the major geological ages of Earth. We've also got body counts - the line graph in the middle shows you how many species survived, which in some cases is nearly zero.

It's hard to decide whether this is a pessimistic chart or an optimistic one. Life always manages to find a way, even when there is a serious destruction of the planet.

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TED: Carl Safina - The oil spill's unseen culprits, victims

The Gulf oil spill dwarfs comprehension, but we know this much: it's bad. Carl Safina scrapes out the facts in this blood-boiling cross-examination, arguing that the consequences will stretch far beyond the Gulf -- and many so-called solutions are making the situation worse.

Carl Safina
Carl Safina's writing explores the scientific, moral and social dimensions of our relationship with nature.

BBC: Humans' early arrival in Britain

Researchers have discovered stone tools in Norfolk, UK, that suggest that early humans arrived in Britain nearly a million years ago - or even earlier.

The find, published in the journal Nature, pushes back the arrival of the first humans in what is now the UK by several hundred thousand years.

Environmental data suggests that temperatures were relatively cool.

This raises the possibility that these early Britons may have been among the first humans to use fire to keep warm.

They may also have been some of the earliest humans to wear fur clothing.

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Inside Natures Giants - The Crocodile

Inside Nature's Giants dissects the largest animals on the planet to uncover their evolutionary secrets. Most wildlife documentaries tell you how an animal behaves, but by dissecting the animal and studying its anatomy we can we can see how an animal works. Experts in comparative anatomy, evolution and behaviour will put some of the most popular and enigmatic large animals under the knife. Veterinary scientist, Mark Evans, will interpret their findings, biologist Simon Watts tests the animals' physiology in the field and Richard Dawkins traces back the animals' place on the tree of life.

The team uncovers the crocodile's incredible jaw muscles, as biologist Simon Watt travels to Florida to test the huge strength of the massive reptile's bite: the most powerful in the animal kingdom. But while crocodiles' spiked teeth are excellent for gripping prey as they plunge into a death roll, they are useless for chewing. So how do these animals manage to digest large chunks of raw meat and bone? As the experts dissect the digestive system and inspect the stomach contents for clues, they reveal the bizarre plumbing between the heart and the stomach that might provide the key to this puzzle. And they also solve the mystery of this crocodile's premature death.

What science is really worth

President Barack Obama says it. Francis Collins, director of the US National Institutes of Health (NIH), says it. University and research leaders elsewhere are saying it, too. The number one current rationale for extra research investment is that it will generate badly needed economic growth.

"Science is more essential for our prosperity, our health, our environment and our quality of life than it has ever been before," said Obama, addressing the National Academy of Sciences in Washington DC last year. Getting down to the details, Collins has recently cited a report by Families USA, a Washington DC-based health-advocacy group, which found that every US$1 spent by the NIH typically generates $2.21 in additional economic output within 12 months.

"Biomedical research has generally been looked at for its health benefits, but the case for it generating economic growth is pretty compelling," says Collins. In Britain, senior scientists have called on the government to support science as a means of helping the economy out of recession. Heeding such arguments, governments in Germany, Sweden, Canada and Australia, as well as the United States, have increased research spending as part of stimulus packages designed to aid their struggling economies.

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Hawking: Religion will be defeated by science

There were some techies Monday who believed they experienced a sighting of God somewhere in San Francisco.

Those people might care to hark at deeply relevant news. God will be defeated by science. No, not by faltering Wi-Fi systems at a conference. And, no, these are not my words. This is the considered opinion of someone sometimes referred to as the cleverest man in the world, Stephen Hawking.

In an interview with ABC's Diane Sawyer, due to air Monday evening, Hawking expounded upon the largest questions, those that transcend iPhones and androids: Can science and God live happily ever after?

According to ABC News, Hawking first tried to define God in a way that he, as a scientist, might feel comfortable: "What could define God (is thinking of God) as the embodiment of the laws of nature. However, this is not what most people would think of that God," he said.

Indeed, he expressed disappointment at how humans have thought of deity.

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Brian Skerry reveals ocean's glory -- and horror

Photographer Brian Skerry shoots life above and below the waves -- as he puts it, both the horror and the magic of the ocean. Sharing amazing, intimate shots of undersea creatures, he shows how powerful images can help make change



Brian Skerry is a photojournalist who captures images that not only celebrate the mystery and beauty of the sea but also bring attention to the pressing issue which endanger our oceans.

Fossil find resolves ancient extinction mystery

Researchers have revealed remarkably well preserved fossils of soft-bodied marine creatures that are between 470 and 480 million years old.

Prior to this find, scientists were unsure whether such creatures died out in an extinction event during an earlier period known as the Cambrian.

The fossils were preserved in rocks formed by layers of ancient marine mud in south-eastern Morocco.

They are described in the latest issue of the journal Nature.

The research team that studied the fossils described them as marine animals that lived during the early part of a period that followed the Cambrian, known as the Ordovician.

Professor Derek Briggs from Yale University in New Haven, US, who was an author of the study, told BBC News that the discovery provided "a much more complete record of early marine life than we've every had before".

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