How Much Matter Died to Fill Your Tank?

Jeff Dukes was driving his lab's huge SUV through the red hills of southern Utah when he asked his wife a question that seemed simple at the time, but led to an astonishing answer.

"We're burning a lot of gas," noted Dukes, then a postdoctoral researcher in ecology at the University of Utah. "Where does all that gas come from?" he asked his wife, also an ecologist.

Months later, after extensive research, Dukes has found his answer. And it casts a new light on the precarious hole that modern humans have dug for themselves.

It turns out that it took tons and tons of tiny plants and animals, buried at the bottom of the seas, lakes or river deltas, to produce every gallon of gasoline that poured through the big engine of that SUV.

It took 98 tons, to be exact, or 196,000 pounds. For every gallon.

Lot of Dead Matter

"That's a shocking number," says Dukes, who is now en route to a new post at the University of Massachusetts in Boston.

And of course nobody burns just one gallon of gasoline. That probably barely got the engine started in Dukes' SUV. We burn millions of gallons every day, and we rely on fossil fuel for a wide range of other energy needs. So how much prehistoric plant and animal material do we need to get through a single year?

Dukes zeroed in on the year 1997, and relying on reports from various agencies, including the United Nations, he came up with statistics that are really astonishing.

He found that the total amount of fossil fuel burned that year amounted to 97 million billion pounds of carbon. That's equivalent to more than 400 times the plant material produced by the entire world during a single year.

So every day, the amount of prehistoric biological material needed to produce the fossil fuels that we burn that day is more than the entire world's production over an entire year.

Phew.

At that rate, it would seem that we should have run out a long time ago, but "fortunately for us, there were huge reserves to begin with,'' Dukes says, thus paving the way for the Industrial Revolution and ultimately, his university's SUV. But his research shows in more graphic terms than most that there are limits to this finite source, and time may well be running out.

The End Matter

Dukes is not your basic alarmist. He didn't set out to scare the daylights out of us. He just wanted to answer a simple question that very few others have tried to answer.

"I decided to try to find out just what goes into a gallon of gas," says Dukes, who first thought that would be a simple task. "I figured I could just do a Web search and find out. That didn't work."

But as a trained scientist with access to all sorts of research, he figured he would just have to dig a little deeper to find a professional paper that answered his basic question.

"I have access to all kinds of great information and searching tools, and I still couldn't find a paper with the answer," he says. "Not even a ballpark estimate."

But he kept digging and soon found himself surrounded by bits and pieces of information. Scientists from various disciplines had looked at different parts of the issue, determining for example how much organic material is lost at each step of the multimillion-year process that turns green organisms into fossil fuel.

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