Biologists are again predicting massive species losses as the world warms. But where are the corpses? There have been few findings of extinctions among continental bird and mammal species over the past 500 years. The species extinctions have been virtually all on islands, as humans have brought such alien predators as rats, cats and Canadian thistles to places where they had no natural enemies.
A new study shows that flying squirrels have been adapting to recent warming since the 1990s by both moving and hybridizing. C.J. Garroway and his research team trapped more than 1,600 of the flying squirrels in Ontario and Pennsylvania between 2002 and 2004.
The flying squirrels' DNA shows the southern G. volans flying squirrels are increasingly mating with the northern G. sabrinus flying squirrels. The researchers say this is the "first report of hybrid zone formation following a range expansion induced by contemporary climate change."
That's certainly interesting, but hardly earth-shaking. Ice cores and fossil pollen show the earth has had six major global warmings since the last Ice Age, interspersed with centuries-long cold periods. The Earth's temperatures are always cycling up and down.
We have even more dramatic evidence of creatures moving to stay at the right temperatures from the city of York, England. Excavations under the city find that the nettle ground bug was common in York during the Roman occupation in the first century, and during the Medieval Warming. In between those warm times, it has typically been found in the much-warmer south of England.
On the other hand, Italian researchers have just finished surveying bird species in a high Piedmont valley where the temperature since the early 1990s has increased about 1 degree Celsius. How did the birds adapt? They did nothing. Sixty-eight bird species were detected in both the 1992-94 survey and the 2003-05 survey. The researchers report "the number of species whose mean elevation increased (42) was higher than the number whose mean elevation decreased (19)." But the birds move up an average of just 29 meters - not statistically different from zero.
Why didn't the birds move? We'd advise asking whether the birds' food sources moved. Higher levels of CO2 allow vegetation to adapt to higher temperatures - without moving. Perhaps the foliage, fruits and insects on which the birds depend didn't change much either.
We might even think about humans adapting to a one-degree change in global average temperatures, rather than destroying our only available energy sources. The net warming since 1850 has been something less than 0.7 C when we allow for the increasing impact of urban heat islands on our thermometer 1 to 3 degree total warming in the early decades. Then the warming rocks along in 30-year up-and-and-down spurts, as we've seen in the Earth's 1915-40 warming, its 1940-75 cooling, and its 1976-98 warming. For centuries at a time. Until the sun brings the next global cooling.
We need to get rid of the biologists' "climate envelope" theory that predicts species extinctions will occur unless their climate environment remains absolutely stable (never has been, never will be). Looking at real global history, species extinctions are more likely to happen when the next asteroid collides with Earth. Those are the times the Earth has lost the vast majority of its species.
...
This commentary was submitted by Dennis Avery, a senior fellow for the Hudson Institute in Washington, D.C., and the director for the Center for Global Food Issues. He was formerly a senior analyst for the Department of State. Readers may write him at P.O. Box 202, Churchville, VA 24421 or e-mail to cgfi@hughes.net.
In 2008, Dan Mathews, vice president of People for the Ethical Treatment of Animals said, "when you consider any movement for social change, it's really got to be seen as a generational one.
"If we as eaters insist on food being a smaller and smaller percentage of our spendable income by continuing to separate ourselves from the source of that food, it will become a race to the bottom for agriculture, for rural communities, and for everyone's quality of life."
Agriculture is a dynamic industry full of growth and change, and yet unlike many other industries, it remains blessed with an abundance of small family-run businesses.
As Obama’s energy taxes force reductions in coal and oil production, the price of U.S. energy will double and triple — and so will the costs of the things we buy.
The cost of the “free wind”? Projections are about 17 cents per kilowatt-hour — far higher than other energy sources. One of my neighbors has just invested $100,000 in a wind turbine. I think he’s wasted his money — and some of yours.
The earthquake in Haiti was a devastating blow — but we don’t know how to prevent earthquakes. On the other hand, we do know how to prevent 500,000 kids from going blind every year, and even dying, due to severe Vitamin A deficiency. But we’re not preventing the blindness or the deaths.
It is increasingly important to remember that almost any human activity of any size or consequence will have both negative and positive externalities. Perhaps the reason for little acknowledgment of the positive externalities is that they are the raison d’être for the activity in the first place.
The USDA seems to expect serious climate-related farming problems ahead, but the recent changes in global climate have been tiny — and in the “wrong” direction.
Commentary
Discussion
Commentary: Species safe even if world warms
Originally published in the June 11, 2010, print edition.
Biologists are again predicting massive species losses as the world warms. But where are the corpses? There have been few findings of extinctions among continental bird and mammal species over the past 500 years. The species extinctions have been virtually all on islands, as humans have brought such alien predators as rats, cats and Canadian thistles to places where they had no natural enemies.
A new study shows that flying squirrels have been adapting to recent warming since the 1990s by both moving and hybridizing. C.J. Garroway and his research team trapped more than 1,600 of the flying squirrels in Ontario and Pennsylvania between 2002 and 2004.
The flying squirrels' DNA shows the southern G. volans flying squirrels are increasingly mating with the northern G. sabrinus flying squirrels. The researchers say this is the "first report of hybrid zone formation following a range expansion induced by contemporary climate change."
That's certainly interesting, but hardly earth-shaking. Ice cores and fossil pollen show the earth has had six major global warmings since the last Ice Age, interspersed with centuries-long cold periods. The Earth's temperatures are always cycling up and down.
We have even more dramatic evidence of creatures moving to stay at the right temperatures from the city of York, England. Excavations under the city find that the nettle ground bug was common in York during the Roman occupation in the first century, and during the Medieval Warming. In between those warm times, it has typically been found in the much-warmer south of England.
On the other hand, Italian researchers have just finished surveying bird species in a high Piedmont valley where the temperature since the early 1990s has increased about 1 degree Celsius. How did the birds adapt? They did nothing. Sixty-eight bird species were detected in both the 1992-94 survey and the 2003-05 survey. The researchers report "the number of species whose mean elevation increased (42) was higher than the number whose mean elevation decreased (19)." But the birds move up an average of just 29 meters - not statistically different from zero.
Why didn't the birds move? We'd advise asking whether the birds' food sources moved. Higher levels of CO2 allow vegetation to adapt to higher temperatures - without moving. Perhaps the foliage, fruits and insects on which the birds depend didn't change much either.
We might even think about humans adapting to a one-degree change in global average temperatures, rather than destroying our only available energy sources. The net warming since 1850 has been something less than 0.7 C when we allow for the increasing impact of urban heat islands on our thermometer 1 to 3 degree total warming in the early decades. Then the warming rocks along in 30-year up-and-and-down spurts, as we've seen in the Earth's 1915-40 warming, its 1940-75 cooling, and its 1976-98 warming. For centuries at a time. Until the sun brings the next global cooling.
We need to get rid of the biologists' "climate envelope" theory that predicts species extinctions will occur unless their climate environment remains absolutely stable (never has been, never will be). Looking at real global history, species extinctions are more likely to happen when the next asteroid collides with Earth. Those are the times the Earth has lost the vast majority of its species.
...
This commentary was submitted by Dennis Avery, a senior fellow for the Hudson Institute in Washington, D.C., and the director for the Center for Global Food Issues. He was formerly a senior analyst for the Department of State. Readers may write him at P.O. Box 202, Churchville, VA 24421 or e-mail to cgfi@hughes.net.
In 2008, Dan Mathews, vice president of People for the Ethical Treatment of Animals said, "when you consider any movement for social change, it's really got to be seen as a generational one.
June 18, 2010
Biologists are again predicting massive species losses as the world warms. But where are the corpses?
June 18, 2010
"If we as eaters insist on food being a smaller and smaller percentage of our spendable income by continuing to separate ourselves from the source of that food, it will become a race to the bottom for agriculture, for rural communities, and for everyone's quality of life."
May 21, 2010
Agriculture is a dynamic industry full of growth and change, and yet unlike many other industries, it remains blessed with an abundance of small family-run businesses.
April 8, 2010
As Obama’s energy taxes force reductions in coal and oil production, the price of U.S. energy will double and triple — and so will the costs of the things we buy.
April 8, 2010
The cost of the “free wind”? Projections are about 17 cents per kilowatt-hour — far higher than other energy sources. One of my neighbors has just invested $100,000 in a wind turbine. I think he’s wasted his money — and some of yours.
February 26, 2010
The earthquake in Haiti was a devastating blow — but we don’t know how to prevent earthquakes. On the other hand, we do know how to prevent 500,000 kids from going blind every year, and even dying, due to severe Vitamin A deficiency. But we’re not preventing the blindness or the deaths.
February 12, 2010
Public deserves science-driven review of pesticide’s health, environmental impacts.
January 29, 2010
It is increasingly important to remember that almost any human activity of any size or consequence will have both negative and positive externalities. Perhaps the reason for little acknowledgment of the positive externalities is that they are the raison d’être for the activity in the first place.
January 29, 2010
The USDA seems to expect serious climate-related farming problems ahead, but the recent changes in global climate have been tiny — and in the “wrong” direction.
January 29, 2010
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