Wind turbine memorial. Illustration: Rob Biddulph Imagine that at the flick of a switch, you could not only turn a light on or off but select which power source you were going to use. Would an eco warrior choose wind power or coal? Surely this is a no-brainer. Not necessarily.

The slaughter at Altamont Pass is being raised by avian scientists who say the drive among environmentalists to rapidly boost U.S. wind farm power 20 times could lead to massive bird losses and even extinctions. New wind projects "have the potential of killing a lot of migratory birds," said Michael Fry, director of conservation advocacy at the American Bird Conservancy in Washington. ...Officials in the wind energy industry say migratory birds and birds of prey, including eagles, are killed each year at some of the nation's biggest wind farms, but they say the concerns are overstated.

Iberdrola SA and E.ON AG's turbine dreams for the windswept Texas Panhandle may be stymied by the mating rituals of the lesser prairie chicken. Wind-power developers such as E.ON are scouring sagebrush and grasslands for the presence of ground-dwelling chickens that could impede turbine construction plans. Once plentiful in the southern high plains, the bird has a high priority for listing under the Endangered Species Act, which would put at risk where as much as $11 billion in turbines that are part of the U.S.'s renewable-energy push can be built.

Turbines already are taking a heavy toll in West Virginia and Pennsylvania. The Pennsylvania Game Commission released a report last spring showing the death rate is highest for bats, which additionally face being wiped out by a mysterious phenomenon called "white-nose syndrome." The evidence has mounted since studies in 2004 showed 1,500 to 4,000 bats annually were killed by the 44 turbines on West Virginia's Backbone Mountain.

Wind energy has been touted as cost-effective to produce clean energy as well as jobs. That promise, along with new government subsidies, has helped wind turbines pop up on hills and fields throughout America. But not every environmentalist is happy about that development. Critics charge that wind-energy development can cause habitat fragmentation-a displacement of a species that can eventually reduce its numbers-as well as the deaths of birds and bats (a species that is especially vulnerable due to its low reproductive rates) that collide with the wind turbines' massive rotor blades.

Should the lesser prairie chicken become listed as threatened or endangered - and it's close now - there would be significant restrictions on companies hoping to plant towering turbines across a five-state region believed to have some of the nation's best wind energy potential. "We've never seen the likes of this," said Texas Parks and Wildlife Department wildlife biologist Heather Whitlaw, who is part of conservation efforts with the other states and believes the bird could be listed within two years. "Anybody who puts anything on our landscape would be evaluated in one form or another."

Cheyenne Wind developers have asked the Department of the Interior to review Wyoming's sage grouse protection policy in light of the state's recent hard-line stance against building wind farms in important habitat areas for the chicken-sized birds. ...Wind developers say they're concerned that Wyoming's position could "abruptly halt wind energy development in Wyoming's sage-grouse 'core areas'.

A utility company on Friday agreed to a settlement of more than $10 million following the electrocution of dozens of eagles, hawks, owls and other birds in Wyoming. PacifiCorp pleaded guilty to 34 violations of the Migratory Bird Treaty Act. U.S. Magistrate Judge Michael Shickich in Casper ordered the utility to pay a $510,000 fine and $900,000 in restitution.

The U.S. Fish and Wildlife Service says it opposes construction of any wind farms in Wyoming's core sage grouse population areas, a position that wind developers say could have a chilling effect on their plans in the state. Brian Kelly, supervisor in the agency's Wyoming field office, made the comments in a letter Tuesday responding to an inquiry from the Wyoming Game and Fish Department.

The federal government has charged PacifiCorp and Exxon Mobil Corp. in two unrelated cases with killing scores of migratory birds in Wyoming, according to court documents filed last week in U.S. District Court in Cheyenne. PacifiCorp, which does business in Wyoming as Rocky Mountain Power, is charged in a 34-count criminal information document with the deaths of 38 golden eagles at power poles in six counties from December 2007 to February 2009.

Federal officials are again delaying whether to list sage grouse in 11 Western states as threatened or endangered -- leaving in limbo until at least 2010 a spate of industries that could face sweeping restrictions if the bird is protected. The chicken-sized grouse ranges from Montana to California alongside livestock grazing, oil and gas drilling and an increasing number of wind power turbines.

Millions of birds funnel through the Texas coast before they head north along the Central Flyway, one of the great bird migration routes between South America and the Arctic. This was the first year that wind farms were operating there during the spring migration. One study near the coastal wind farms in Kenedy County, near the Laguna Madre, found that at the peak of fall migration in 2007, 4,000 birds an hour passed in a 1-kilometer-wide band.

Development of wind energy and sage grouse protection are on a collision course in Wyoming, where state officials are worried that a future Endangered Species Act listing for the chicken-like bird could ruin the golden egg laid by the Obama administration's renewable energy mandates. ..."The bird does well in the existing conditions that are out here. It's the new threat from wind energy that has got us so worried," said Aaron Clark, special adviser on energy infrastructure to Wyoming Gov. Dave Freudenthal (D). "I don't think you could justify a [federal endangered species] listing for that bird in Wyoming without the threat from wind development."

The Bureau of Land Management is using some stimulus money to study the effect of wind farms on a dwindling sage grouse population in Central Oregon. BLM spokesman Michael Campbell said the agency hopes to lessen or eliminate any impact. The agency would hire people to tag sage grouse in areas where wind farms are proposed and track the birds' movements to figure out where turbines could be located. Contracts have not yet been awarded.

As the Obama administration pursues more homegrown energy sources, a new government report faults energy production of all types - wind, ethanol and mountaintop coal mining - for contributing to steep drops in bird populations. The first-of-its-kind government report chronicles a four-decade decline in many of the country's bird populations and provides many reasons for it, from suburban sprawl to the spread of exotic species to global warming.

The Minerals Management Service's 800 page Final Environmental Impact Statement on Cape Wind was released on Friday and in a largely favorable review found nearly all impacts to be negligible or minor. The few exceptions, where the 130 turbine wind farm would potentially or certainly have moderate to major impact were on birds, especially marine birds such as terns or sea ducks, on navigation and safety of recreational or commercial fishing boats, although those effects could be mitigated, and on visual resources of Nantucket Sound.

A half-century of restoration efforts have bred the world's last 15 whooping cranes to create one, and only one, viable flock of 267 wild birds. But now, that progress may be reversed in the name of another environmental cause: renewable energy.

Birds are in big trouble in North America. A recent study found 127 species of neotropical migratory birds are in decline. How badly? The Black-chinned Sparrow population has fallen 89 per cent over the past 40 years, the Cerulean Warbler is down 83 per cent, and Sprague's Pipit population has declined by 81 per cent. So drastically have overall migratory bird populations fallen that one scientist who compared weather satellite images over time, found that migrating bird flocks were 50 per cent smaller than they were several years ago. Last week in Washington, Congress began hearings into the crisis and there were calls on the government to boost funding to the Neotropical Migratory Bird Conservation Act.

Researchers studying birds killed by power lines are encouraged by recent findings from a study in the Dakotas that could hold implications throughout the Central Flyway, the major migration route that stretches from Canada to Texas. Wildlife deaths from power lines, wind turbines and other structures are a growing concern across the country, said Al Manville, a senior wildlife biologist with the U.S. Fish and Wildlife Service. More transmission lines and wind turbines are planned in coming years, which could put several bird species at risk, Manville said. ...Research is important, partly because "birds play a key role in the ecosystem," said Greg Butcher, director of bird conservation at the National Audubon Society.

Scientists are increasingly concerned about the number of birds killed by running into power lines and wind turbines, said Al Manville, a senior wildlife biologist with the U.S. Fish and Wildlife Service, but there are reports of success in preventing such incidents - at least in the case of the power lines. More lines and turbines are planned in coming years, which could put several species of birds at risk, Manville said. "We've got to address our carbon footprint and deal with climate change," he said, "but we want to make sure, in the process, we don't create new problems."