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Ancient Ice Reveals Man's Harmful Effects on the Atmosphere
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Studies of ancient Antarctic ice cores are shedding light on the impact that the history of human development has had on the environment. Tests show
that atmospheric carbon dioxide levels have increased nearly 25% in the past two centuries alone.
www.nytimes.com
Shafts of ancient ice pulled from Antarctica's frozen depths show that for at least 650,000 years three important heat-trapping greenhouse gases never reached recent atmospheric levels caused by human activities, scientists are reporting today.
The measured gases were carbon dioxide, methane and nitrous oxide. Concentrations have risen over the last several centuries at a pace far beyond that seen before humans began intensively clearing forests and burning coal, oil and other fossil fuels.
The sampling and analysis were done by the European Program for Ice Coring in Antarctica, and the results are being published today in the journal Science.
The evidence was found in air bubbles trapped in successively older ice samples extracted from a nearly two-mile-deep hole drilled in a remote spot in East Antarctica called Dome C.
Please visit the link provided for the complete story.
Humans are impacting nature on this planet at an unprecedented rate. Toxic biproducts of human development have been unavoidable as we, as a race, have achieved previously unimaginable levels of comfort and technology.
Can we develop technology to reverse the damage that we have done to the environment? It may prove to be the most difficult challenge mankind has faced - because there is no money in it.
Related News Links:
www.latimes.com
www.nature.com
today. reuters.com
www.ktvotv3.com
[edit on 11/24/2005 by Zipdot]
[edit on 12/1/05 by FredT]
www.nytimes.com
Shafts of ancient ice pulled from Antarctica's frozen depths show that for at least 650,000 years three important heat-trapping greenhouse gases never reached recent atmospheric levels caused by human activities, scientists are reporting today.
The measured gases were carbon dioxide, methane and nitrous oxide. Concentrations have risen over the last several centuries at a pace far beyond that seen before humans began intensively clearing forests and burning coal, oil and other fossil fuels.
The sampling and analysis were done by the European Program for Ice Coring in Antarctica, and the results are being published today in the journal Science.
The evidence was found in air bubbles trapped in successively older ice samples extracted from a nearly two-mile-deep hole drilled in a remote spot in East Antarctica called Dome C.
Please visit the link provided for the complete story.
Humans are impacting nature on this planet at an unprecedented rate. Toxic biproducts of human development have been unavoidable as we, as a race, have achieved previously unimaginable levels of comfort and technology.
Can we develop technology to reverse the damage that we have done to the environment? It may prove to be the most difficult challenge mankind has faced - because there is no money in it.
Related News Links:
www.latimes.com
www.nature.com
today. reuters.com
www.ktvotv3.com
[edit on 11/24/2005 by Zipdot]
[edit on 12/1/05 by FredT]
This is a Duplicate ATSNN Story. Here is the original
CO2 Levels Highest Than At Any Time In The Last 650,000 Years
CO2 Levels Highest Than At Any Time In The Last 650,000 Years
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