They used to mine coal in the abandoned town of Carbon. Now this patch of southern Wyoming is a battleground in the debate over what many hope will be the clean energy source of the future: Wind power.
At the heart of the dispute are plans to build a network of wind farms in the American West that conservationists fear could disrupt threatened habitat such as sage brush, a dwindling piece of the region's fragile ecosystem.
This has made the greater sage grouse - which as its name suggests is totally dependent on sage brush - an unlikely poster child for some US environmentalists, in much the same way that the rare spotted owl became a symbol in the 1980s of pitched battles with the logging industry.
Wyoming is home to 54 per cent of the greater sage grouse population in North America. The bird's status is being evaluated for inclusion on the US government's threatened or endangered species list, which would give it more protection.
The problem: The chicken-sized bird lives in the vast tracts of wind-whipped open spaces that make Wyoming highly attractive to the wind industry.
Near Carbon, the focus is on a 198-turbine, €421 million wind farm proposed by Horizon Wind Energy.
"They want to build it around here but we need to be thinking truly green. It is not just about our carbon footprint," said Alison Holloran of the National Audubon Society in Wyoming, as she pointed to clumps of grayish sage brush along a dirt road.
Wind power will play a huge role in any move by the US to reduce its emissions of the greenhouse gases that most scientists believe are the main causes of rapid climate change. The burning of coal and the use of other fossil fuels such as oil are the largest single source of carbon emissions, so the race is on for "clean energy" alternatives.
In the public mind, wind is regarded as about as "green" an energy source as you can get. But some environmentalists see shades of brown in the industry.
They say the wind turbines and the development that goes with them, including roads and transmission lines, will further fragment critical sage habitat and disturb the grouse and other wildlife.
Horizon says the grouse issue requires more study.
"There is no peer-reviewed research on how sage grouse respond to turbines," said Arlo Corwin, Horizon's development director for the western region. "We believe that obtaining this research is essential to see if wind turbines and sage grouse are going to be able to coexist."
There have been several wind power skirmishes in the US. Off Cape Cod in Massachusetts, there is a battle over plans for an offshore wind farm that opponents say will disrupt navigation and shipping. There have also been concerns about bird/turbine collisions in some places.