Earth Entering Sixth Extinction Phase, Species Disappearing 100 Times

[KillChillPandey]

MIAMI:  The world is embarking on its sixth mass extinction with animals disappearing about 100 times faster than they used to, scientists warned Friday, and humans could be among the first victims.

Not since the age of the dinosaurs ended 66 million years ago has the planet been losing species at this rapid a rate, said a study led by experts at Stanford University, Princeton University and the University of California, Berkeley.

The study "shows without any significant doubt that we are now entering the sixth great mass extinction event," said co-author Paul Ehrlich, a Stanford University professor of biology.
 

 

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And humans are likely to be among the species lost, said the study - which its authors described as "conservative" - published in the journal Science Advances.

"If it is allowed to continue, life would take many millions of years to recover and our species itself would likely disappear early on," said lead author Gerardo Ceballos of the Universidad Autonoma de Mexico.

The analysis is based on documented extinctions of vertebrates, or animals with internal skeletons such as frogs, reptiles and tigers, from fossil records and other historical data.

The modern rate of species loss was compared to the "natural rates of species disappearance before human activity dominated."

It can be difficult to estimate this rate, also known as the background rate, since humans don't know exactly what happened throughout the course of Earth's 4.5 billion year history.

For the study, researchers used a past extinction rate that was twice as high as widely used estimates.

If the past rate was two mammal extinctions per 10,000 species per 100 years, then the "average rate of vertebrate species loss over the last century is up to 114 times higher than it would be without human activity, even when relying on the most conservative estimates of species extinction," said the study.

"We emphasize that our calculations very likely underestimate the severity of the extinction crisis because our aim was to place a realistic lower bound on humanity's impact on biodiversity."

The causes of species loss range from climate change to pollution to deforestation and more.

According to the International Union for Conservation of Nature, about 41 percent of all amphibian species and 26 percent of all mammals are threatened with extinction.

"There are examples of species all over the world that are essentially the walking dead," Ehrlich said.

The study called for "rapid, greatly intensified efforts to conserve already threatened species, and to alleviate pressures on their populations - notably habitat loss, over-exploitation for economic gain and climate change."

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[KillChillPandey]

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[KillChillPandey]

The Earth has entered a new period of extinction, a study by three US universities has concluded, and humans could be among the first casualties.

The report, led by the universities of Stanford, Princeton and Berkeley, said vertebrates were disappearing at a rate 114 times faster than normal.

The findings echo those in a report published by Duke University last year.

One of the new study's authors said: "We are now entering the sixth great mass extinction event."

The last such event was 65 million years ago, when dinosaurs were wiped out, in all likelihood by a large meteor hitting Earth.

"If it is allowed to continue, life would take many millions of years to recover and our species itself would likely disappear early on," said the lead author, Gerardo Ceballos.

Pollination by bees could disappear within three generations, the report warns

The scientists looked at historic rates of extinction for vertebrates - animals with backbones - by assessing fossil records.

They found that the current extinction rate was more than 100 times higher than in periods when Earth was not going through a mass extinction event.

Since 1900, the report says, more than 400 more vertebrates had disappeared.

Such a loss would normally be seen over a period of up to 10,000 years, the scientists say.

The study - published in the Science Advances journal - cites causes such as climate change, pollution and deforestation.

Given the knock-on effect of ecosystems being destroyed, the report says benefits such as pollination by bees could be lost within three human generations.

Extinction may be more gradual than when the dinosaurs died, the report says

Stanford University professor Paul Ehrlich said: "There are examples of species all over the world that are essentially the walking dead.

"We are sawing off the limb that we are sitting on."

The International Union for Conservation of Nature (IUCN) says at least 50 animals move closer to extinction every year.

Around 41% of all amphibians and 25% of mammals are threatened with extinction, it says.

Most at risk: the lemur

According to the IUCN, the lemur faces a real struggle to avoid extinction in the wild in the coming years.

The group says that 94% of all lemurs are under threat, with more than a fifth of all lemur species classed as "critically endangered".

As well as seeing their habitat in Madagascar destroyed by illegal logging, lemurs are also regularly hunted for their meat, the IUCN says.

What were the five mass extinction events?

Last year, a report by Stuart Pimm, a biologist and extinction expert at Duke University in North Carolina, also warned mankind was entering a sixth mass extinction event.

But Mr Pimm's report said the current rate of extinction was more than 1,000 times faster than in the past, not 114, as the new report claims.

The new report's authors said it was still possible to avoid a "dramatic decay of biodiversity" through intensive conservation, but that rapid action was needed.

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