Earth Changes
Don't set the holiday picnic table just yet. You might need to clear some snow first.
Britain's astounding April, the warmest on record, has produced an astounding effect in the natural world, with at least 11 species of butterfly making their earliest recorded appearances this spring in what will be seen as the most remarkable demonstration yet of the effects of climate change on Britain's wildlife.
Once the bugs locate prey, they stun it with a bite. "It's much, much worse than a bee or wasp sting," Sites said. "I was bitten in the pad of my little finger, and I felt intense pain all the way to my elbow for a good 30 minutes."
After the prey is stunned, the predatory insects whip a straw-like appendage out and pump toxins into their meal, liquefying it from the inside-out. "After that, they suck out the juice," Sites said.
After the prey is stunned, the predatory insects whip a straw-like appendage out and pump toxins into their meal, liquefying it from the inside-out. "After that, they suck out the juice," Sites said.
The southwestern mountains of Colorado are under a snow advisory, with up to 8 inches of accumulation possible by early evening.
A freeze watch is in effect for tonight in the San Luis Valley region and much of southeastern Colorado is under a flash flood watch.
A freeze watch is in effect for tonight in the San Luis Valley region and much of southeastern Colorado is under a flash flood watch.
Disappearing tigers:
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| ©Signs of the Times |
| Disappearing tigers |
Early results from a tiger census in India indicate the population of the endangered big cats is drastically lower than previously assumed, wildlife experts and conservationists said on Wednesday.
Victorian Premier Steve Bracks says the proposed $10 billion federal takeover of the Murray-Darling basin is back to square one.
Mr Bracks has written to Prime Minister John Howard rejecting the second draft of the legislation.
He says the Federal Government had indicated it would no longer seek total control of the basin, but the new legislation still demands the states refer all their powers to the Commonwealth.
Mr Bracks has written to Prime Minister John Howard rejecting the second draft of the legislation.
He says the Federal Government had indicated it would no longer seek total control of the basin, but the new legislation still demands the states refer all their powers to the Commonwealth.
Comment: Could Australia be used as a "test lab" for USA water policy?
Tiny amounts of the estrogen used in birth control pills can cause wild fish populations to collapse, according to a new study.
The finding raises concern about even low levels of estrogen in municipal wastewater, said study leader Karen Kidd, a biologist with the Canadian Rivers Institute at the University of New Brunswick.
"Women excrete estrogen naturally, and women on birth control pills also secrete the synthetic estrogen in those pills," she explained.
"And these estrogens, depending on the level of wastewater treatment, may not be completely broken down during sewage treatment, so they get discharged into rivers and streams."
Male fish exposed to the hormone become feminized - they produce the same proteins that female fish do to develop eggs. Some males even develop eggs in their testes.
"It doesn't take a lot of estrogen to feminize male fish and, based on the results of our experiment, to impact fish populations," Kidd said. (Learn more about freshwater pollution.)
The finding raises concern about even low levels of estrogen in municipal wastewater, said study leader Karen Kidd, a biologist with the Canadian Rivers Institute at the University of New Brunswick.
"Women excrete estrogen naturally, and women on birth control pills also secrete the synthetic estrogen in those pills," she explained.
"And these estrogens, depending on the level of wastewater treatment, may not be completely broken down during sewage treatment, so they get discharged into rivers and streams."
Male fish exposed to the hormone become feminized - they produce the same proteins that female fish do to develop eggs. Some males even develop eggs in their testes.
"It doesn't take a lot of estrogen to feminize male fish and, based on the results of our experiment, to impact fish populations," Kidd said. (Learn more about freshwater pollution.)
Government forecasters called for a busier than normal hurricane season Tuesday.
National Weather Service forecasters said they expect 13 to 17 tropical storms, with seven to 10 of them becoming hurricanes.
The forecast follows that of two other leading storm experts in anticipating a busy season.
The likelihood of above normal hurricane activity is 75 percent, the National Oceanic and Atmospheric Administration said.
"With expectations for an active season, it is critically important that people who live in East and Gulf coastal areas as well as the Caribbean be prepared,'' said Bill Proenza director of the national hurricane center in Miami.
National Weather Service forecasters said they expect 13 to 17 tropical storms, with seven to 10 of them becoming hurricanes.
The forecast follows that of two other leading storm experts in anticipating a busy season.
The likelihood of above normal hurricane activity is 75 percent, the National Oceanic and Atmospheric Administration said.
"With expectations for an active season, it is critically important that people who live in East and Gulf coastal areas as well as the Caribbean be prepared,'' said Bill Proenza director of the national hurricane center in Miami.
As the Earth's temperatures continue to rise, we can expect a signficant change in infectious disease patterns around the globe. Just exactly what those changes will be remains unclear, but scientists agree they will not be for the good.
"Environmental changes have always been associated with the appearance of new diseases or the arrival of old diseases in new places. With more changes, we can expect more surprises," says Stephen Morse of Columbia University, speaking May 22, 2007, at the 107th General Meeting of the American Society for Microbiology in Toronto.
In its April 2007 report on the impacts of climate change, the Intergovernmental Panel on Climate Change (IPCC) warned that rising temperatures may result in "the altered spatial distribution of some infectious disease vectors," and will have "mixed effects, such as the decrease or increase of the range and transmission potential of malaria in Africa."
"Diseases carried by insects and ticks are likely to be affected by environmental changes because these creatures are themselves very sensitive to vegetation type, temperature, humidity etc. However, the direction of change - whether the diseases will increase or decrease - is much more difficult to predict, because disease transmission involves many factors, some of which will increase and some decrease with environmental change. A combination of historical disease records and present-day ground-based surveillance, remotely sensed (satellite) and other data, and good predictive models is needed to describe the past, explain the present and predict the future of vector-borne infectious diseases," says David Rogers of Oxford University, also speaking at the meeting.
"Environmental changes have always been associated with the appearance of new diseases or the arrival of old diseases in new places. With more changes, we can expect more surprises," says Stephen Morse of Columbia University, speaking May 22, 2007, at the 107th General Meeting of the American Society for Microbiology in Toronto.
In its April 2007 report on the impacts of climate change, the Intergovernmental Panel on Climate Change (IPCC) warned that rising temperatures may result in "the altered spatial distribution of some infectious disease vectors," and will have "mixed effects, such as the decrease or increase of the range and transmission potential of malaria in Africa."
"Diseases carried by insects and ticks are likely to be affected by environmental changes because these creatures are themselves very sensitive to vegetation type, temperature, humidity etc. However, the direction of change - whether the diseases will increase or decrease - is much more difficult to predict, because disease transmission involves many factors, some of which will increase and some decrease with environmental change. A combination of historical disease records and present-day ground-based surveillance, remotely sensed (satellite) and other data, and good predictive models is needed to describe the past, explain the present and predict the future of vector-borne infectious diseases," says David Rogers of Oxford University, also speaking at the meeting.
Time may be running out for polar bears as global warming melts the ice beneath their paws.
Restrictions or bans on hunting in recent decades have helped protect many populations of the iconic Arctic carnivore, but many experts say the long-term outlook is bleak.
An estimated 20,000-25,000 bears live around the Arctic -- in Canada, Russia, Alaska, Greenland and Norway -- and countries are struggling to work out ways to protect them amid forecasts of an accelerating thaw.
Restrictions or bans on hunting in recent decades have helped protect many populations of the iconic Arctic carnivore, but many experts say the long-term outlook is bleak.
An estimated 20,000-25,000 bears live around the Arctic -- in Canada, Russia, Alaska, Greenland and Norway -- and countries are struggling to work out ways to protect them amid forecasts of an accelerating thaw.
Comment: For more information on the weather see this article.