The same coal technology that gave Britain such global advantages also brought great misery in its wake. As noted by energy analyst Paul Roberts in The End of Oil, the coal then being consumed in England was of the brown lignite variety, "chock full of sulfur and other impurities." When burned, "it produced an acrid, choking smoke that stung the eyes and lungs and blackened walls and clothes." By the end of the nineteenth century, the air in London and other coal-powered cities was so polluted that "trees died, marble facades dissolved, and respiratory ailments became epidemic."
For Great Britain and other early industrial powers, the substitution of oil and gas for coal was a godsend, allowing improved air quality, the restoration of cities, and a reduction in respiratory ailments. In many parts of the world, of course, the Age of Coal is not over. In China and India, among other places, coal remains the principal source of energy, condemning their cities and populations to a twenty-first-century version of nineteenth-century London and Manchester.
The Second Carbon Era
The Age of Oil got its start in 1859 when commercial production began in western Pennsylvania, but only truly took off after World War II, with the explosive growth of automobile ownership. Before 1940, oil played an important role in illumination and lubrication, among other applications, but remained subordinate to coal; after the war, oil became the world's principal source of energy. From 10 million barrels per day in 1950, global consumption soared to 77 million in 2000, a half-century bacchanalia of fossil fuel burning.
Driving the global ascendancy of petroleum was its close association with the internal combustion engine (ICE). Due to oil's superior portability and energy intensity (that is, the amount of energy it releases per unit of volume), it makes the ideal fuel for mobile, versatile ICEs. Just as coal rose to prominence by fueling steam engines, so oil came to prominence by fueling the world's growing fleets of cars, trucks, planes, trains, and ships. Today, petroleum supplies about 97% of all energy used in transportation worldwide.
Oil's prominence was also assured by its growing utilization in agriculture and warfare. In a relatively short period of time, oil-powered tractors and other agricultural machines replaced animals as the primary source of power on farms around the world. A similar transition occurred on the modern battlefield, with oil-powered tanks and planes replacing the cavalry as the main source of offensive power.
These were the years of mass automobile ownership, continent-spanning highways, endless suburbs, giant malls, cheap flights, mechanized agriculture, artificial fibers, and -- above all else -- the global expansion of American power. Because the United States possessed mammoth reserves of oil, was the first to master the technology of oil extraction and refining, and the most successful at utilizing petroleum in transportation, manufacturing, agriculture, and war, it emerged as the richest and most powerful country of the twenty-first century, a saga told with great relish by energy historian Daniel Yergin in The Prize. Thanks to the technology of oil, the U.S. was able to accumulate staggering levels of wealth, deploy armies and military bases to every continent, and control the global air and sea-lanes -- extending its power to every corner of the planet.
However, just as Britain experienced negative consequences from its excessive reliance on coal, so the United States -- and the rest of the world -- has suffered in various ways from its reliance on oil. To ensure the safety of its overseas sources of supply, Washington has established tortuous relationships with foreign oil suppliers and has fought several costly, debilitating wars in the Persian Gulf region, a sordid history I recount in Blood and Oil. Overreliance on motor vehicles for personal and commercial transportation has left the country ill-equipped to deal with periodic supply disruptions and price spikes. Most of all, the vast increase in oil consumption -- here and elsewhere -- has produced a corresponding increase in carbon dioxide emissions, accelerating planetary warming (a process begun during the first carbon era) and exposing the country to the ever more devastating effects of climate change.
The Age of Unconventional Oil and Gas
The explosive growth of automotive and aviation travel, the suburbanization of significant parts of the planet, the mechanization of agriculture and warfare, the global supremacy of the United States, and the onset of climate change: these were the hallmarks of the exploitation of conventional petroleum. At present, most of the world's oil is still obtained from a few hundred giant onshore fields in Iran, Iraq, Kuwait, Russia, Saudi Arabia, the United Arab Emirates, the United States, and Venezuela, among other countries; some additional oil is acquired from offshore fields in the North Sea, the Gulf of Guinea, and the Gulf of Mexico. This oil comes out of the ground in liquid form and requires relatively little processing before being refined into commercial fuels.
But such conventional oil is disappearing. According to the IEA, the major fields that currently provide the lion's share of global petroleum will lose two-thirds of their production over the next 25 years, with their net output plunging from 68 million barrels per day in 2009 to a mere 26 million barrels in 2035. The IEA assures us that new oil will be found to replace those lost supplies, but most of this will be of an unconventional nature. In the coming decades, unconventional oils will account for a growing share of the global petroleum inventory, eventually becoming our main source of supply.
The same is true for natural gas, the second most important source of world energy. The global supply of conventional gas, like conventional oil, is shrinking, and we are becoming increasingly dependent on unconventional sources of supply -- especially from the Arctic, the deep oceans, and shale rock via hydraulic fracturing.
In certain ways, unconventional hydrocarbons are akin to conventional fuels. Both are largely composed of hydrogen and carbon, and can be burned to produce heat and energy. But in time the differences between them will make an ever-greater difference to us. Unconventional fuels -- especially heavy oils and tar sands -- tend to possess a higher proportion of carbon to hydrogen than conventional oil, and so release more carbon dioxide when burned. Arctic and deep-offshore oil require more energy to extract, and so produce higher carbon emissions in their very production.
"Many new breeds of petroleum fuels are nothing like conventional oil," Deborah Gordon, a specialist on the topic at the Carnegie Endowment for International Peace, wrote in 2012. "Unconventional oils tend to be heavy, complex, carbon laden, and locked up deep in the earth, tightly trapped between or bound to sand, tar, and rock."
By far the most worrisome consequence of the distinctive nature of unconventional fuels is their extreme impact on the environment. Because they are often characterized by higher ratios of carbon to hydrogen, and generally require more energy to extract and be converted into usable materials, they produce more carbon dioxide emissions per unit of energy released. In addition, the process that produces shale gas, hailed as a "clean" fossil fuel, is believed by many scientists to cause widespread releases of methane, a particularly potent greenhouse gas.
All of this means that, as the consumption of fossil fuels grows, increasing, not decreasing, amounts of CO2 and methane will be released into the atmosphere and, instead of slowing, global warming will speed up.
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