If you pinned a map of the United States to a dartboard, Kansas would be the bull's-eye. Smack dab in the center of the country, the Sunflower State is one of America's most productive agricultural hotbeds-the fifth-biggest producer of crops and livestock in the country. More than 90 percent of the state consists of farmland endowed thousands of years ago with rich glacial loam. This fertile topsoil is no longer as robust as it once was, having offered up its nutrients season after season, decade after decade, century after century, to produce great bounties of wheat, corn, soybeans, sorghum, hay, and sunflowers. I could almost sense the exhaustion of the land as I drove through the back roads of northeastern Kansas one chilly November morning-past sagging wooden farmhouses silvered by age and weather, barbed-wire fences with listing wooden posts, general stores and swinging-door saloons, a Native American heritage museum commemorating the Kansa tribes that once roamed and tilled these prairies, and mile after desolate mile of denuded farmland.

It wasn't that this dormant soil was incapable of producing-on the contrary, during the previous summer and fall it had yielded one of the most plentiful harvests in Kansas history, many times greater than the bounty of a century earlier, when the land was more inherently fertile. But now, like an aging bull receiving shots of testosterone, this well-worn ground reaps the benefits of modern chemistry-and good old-fashioned fossil fuels.

That late fall morning, thousands of tractors combed the Kansas countryside, priming the soil for next spring's planting with a "booster shot" of nutrients that would turn the weary earth into some of the world's highest-producing farmland. That chemical nourishment, also known as fertilizer, has transformed America's economy over the last century, and expanded the global population, too, by vastly increasing the food supply.

Nitrogen, potassium, and phosphorous are the three most common nutrients in the fertilizers applied to American farmlands, nitrogen being by far the most prevalent. The main form of nitrogen fertilizer is known as anhydrous ammonia, and natural gas is its primary feedstock. Nitrogen fertilizers take many forms, ranging from the Miracle-Gro sold at your local Home Depot to the industrial-strength anhydrous ammonia that's used on tens of millions of acres of U.S. corn and wheat crops.  Each year, American farmers apply 6.2 billion pounds of fossil-fuel-based fertilizers to their croplands.

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