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Next time you turn up the AC or pop in a DVD, spare a thought for places like Gibson and for the grimy fuel it devours at the rate of three 100-car trainloads a day. Coal-burning power plants like this one supply the United States with half its electricity. They also emit a stew of damaging substances, including sulfur dioxide—a major cause of acid rain—and mercury. And they gush as much climate-warming carbon dioxide as America's cars, trucks, buses, and planes combined.

Here and there, in small demonstration projects, engineers are exploring technologies that could turn coal into power without these environmental costs. Yet unless utilities start building such plants soon—and lots of them—the future is likely to hold many more traditional stations like Gibson.

Last summer's voracious electricity use was just a preview. Americans' taste for bigger houses, along with population growth in the West and air-conditioning-dependent Southeast, will help push up the U.S. appetite for power by a third over the next 20 years, according to the Department of Energy. And in the developing world, especially China, electricity needs will rise even faster as factories burgeon and hundreds of millions of people buy their first refrigerators and TVs. Much of that demand is likely to be met with coal.

For the past 15 years U.S. utilities needing to add power have mainly built plants that burn natural gas, a relatively clean fuel. But a near tripling of natural gas prices in the past seven years has idled many gas-fired plants and put a damper on new construction. Neither nuclear energy nor alternative sources such as wind and solar seem likely to meet the demand for electricity.

Meanwhile, more than a quarter trillion tons of coal lie underfoot, from the Appalachians through the Illinois Basin to the Rocky Mountains —enough to last 250 years at today's consumption rate. You hear it again and again: The U.S. is the Saudi Arabia of coal. About 40 coal-burning power plants are now being designed or built in the U.S. China, also rich in coal, could build several hundred by 2025.

Mining enough coal to satisfy this growing appetite will take a toll on lands and communities (see following story, page 104). Of all fossil fuels, coal puts out the most carbon dioxide per unit of energy, so burning it poses a further threat to global climate, already warming alarmingly. With much government prodding, coal-burning utilities have cut pollutants such as sulfur dioxide and nitrogen oxides by installing equipment like the building-size scrubbers and catalytic units crowded behind the Gibson plant. But the carbon dioxide that drives global warming simply goes up the stacks—nearly two billion tons of it each year from U.S. coal plants. Within the next two decades that amount could rise by a third.

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