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"In effect, we are currently responsible for the sixth major extinction event in the history of the Earth, and the greatest since the dinosaurs disappeared, 65 million years ago,"
In effect, we are currently responsible for the sixth major extinction event in the history of the Earth, and the greatest since the dinosaurs disappeared, 65 million years ago," the report states.
Originally posted by engenerQ
In effect, we are currently responsible for the sixth major extinction event in the history of the Earth, and the greatest since the dinosaurs disappeared, 65 million years ago," the report states.
Funniest thing I have heard in a while, yet another blunder from the people who brought you food for oil
the link they give for there facts goes to a space site
"In effect, we are currently responsible for the sixth major extinction event in the history of the Earth, and the greatest since the dinosaurs disappeared, 65 million years ago," the report states. ...The wide-ranging report also states that demand for resources globally exceeds the biological capacity of the Earth by some 20 percent.
Among the findings:
* The average abundance of species declined 40 percent between 1970 and 2000 while species in rivers, lakes and marshlands have declined by 50 percent.
* Between 12 and 52 percent of species within well-studied higher taxa including birds, mammals and amphibians are threatened with extinction.
* In the North Atlantic, populations of large fish have declined 66 percent in the last 50 years.
* Since 2000, 6 million hectares of primary forest have been lost annually.
* In the Caribbean, average hard coral cover declined from 10 to 50 percent in the last three decades.
* 35 percent of the world's mangroves have been lost in the last two decades.
"Two thirds of the services provided by nature to humankind are in decline, worldwide," said Ahmed Djoghlaf, Executive Secretary of the U.N.'s Convention on Biological Diversity, in an open letter to all of the planet's citizens. "Humans have made unprecedented changes to ecosystems in recent decades to meet growing demands for food and other ecosystems services." ...The report offers simple economic logic for maintaining biodiversity: "Biodiversity loss disrupts ecosystem functions, making ecosystems more vulnerable to shocks and disturbances, less resilient, and less able to supply humans with needed services."
Biodiversity loss has "weakened nature's ability to deliver its vital services," Djoghlaf writes. "Human activity is putting such strain on the natural functions of Earth that the ability of the planet's ecosystems to sustain future generations can no longer be taken for granted."
Originally posted by engenerQ
Funniest thing I have heard in a while, yet another blunder from the people who brought you food for oil
the link they give for there facts goes to a space site
and the extinction event has been going on for thousands of years….funny they didn’t mention that.
Time will tell
Well the dinosaur extinction did not take place as rapidly as thought. That event lasted (at various times around the K/T boundry) from several thousand years to over 2 million
Originally posted by ShadowXIX
We can throw out all types of theories though like super germs, cancer and such we likely will never be able to prove.
Originally posted by engenerQ
...how do you explain the extinction rate has stayed hypothetically constant
It is often difficult to determine exactly when mass extinction events have occurred in the Earth's history - the fossil record is not perfect, and the poorer the record for a particular time frame, the more it is open to different interpretations. Some scientists have suggested that there is a cycle of mass extinctions, with a major die off every 26 million years or so. This would imply that there have been some 23 extinction events since the Cambrian, a figure which is at the upper limit of most estimates. While we remain unsure of the total number, there is general agreement over the existence of 6 major extinction events.