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Dreaming the Impossible Green Dream

Tip o’ the hat to Ocotillo Wind Turbine Destruction for the article.

Robert Bryce — Wall Street Journal — June 17, 2014

In the June 5 issue of Rolling Stone magazine, Bill McKibben declares his desire to “set the world on a fundamentally new course.” He’s inviting fellow climate-change activists to participate in a “People’s Climate March” in New York City on Sept. 20—which he hopes will be the “largest demonstration yet of human resolve in the face of climate change.”

Mr. McKibben is among the world’s most famous environmentalists. He’s written or edited 15 books and been awarded honorary degrees from 18 colleges and universities. He is also the founder of 350.org, whose goal is to reduce atmospheric carbon-dioxide levels to 350 parts per million from the current level of about 400 parts per million. To achieve that goal, he’s written that “we need to cut our fossil fuel use by a factor of twenty over the next few decades.”

But what are the actual implications of cutting fossil fuels 20-fold? Let’s “do the math,” as Mr. McKibben is fond of saying.

Global hydrocarbon consumption is now about 218 million barrels of oil equivalent energy a day, according to the BP Statistical Review of World Energy, which includes 83 million barrels of oil as well as about 75 million barrels of oil equivalent from coal and about 60 million barrels of oil equivalent from natural gas. Reducing that by a factor of 20 would cut global hydrocarbon use to the energy equivalent of 11 million barrels of oil a day, roughly the amount of energy now consumed by India, where 400 million people lack access to electricity.

In 2012, the average resident of planet Earth consumed about 1.3 gallons of oil-equivalent energy a day from hydrocarbons. If Mr. McKibben’s plan were enacted—and we shared those available hydrocarbons equally—-each of us would be allotted about eight fluid ounces of oil-equivalent energy from hydrocarbons a day. Today, the average resident of Bangladesh uses about half a liter of oil equivalent—slightly less than 17 ounces—a day. Under Mr. McKibben’s prescription, the average Bangladeshi would be required to cut his hydrocarbon use by about half.

Like many others among the green left, Mr. McKibben insists that the prospect of catastrophic climate change means we must rely solely on renewable energy (and no nuclear power, either). What would that mean? Again, let’s “do the math.” And to keep it simple, let’s ignore oil (even though it accounts for about a third of all energy consumption) and focus solely on electricity.

Over the past three decades, according to the BP Review, global electricity demand has been growing by about 450 terawatt-hours a year. And the International Energy Agency expects power demand will continue growing by about that pace for the next two decades.

What would be required if we relied on solar energy to keep up with expected growth in electricity demand? Let’s look at Germany, which has more solar capacity than any other country, about 33,000 megawatts. In 2012 those solar facilities produced 28 terawatt-hours of electricity. Thus the world would have to install about 16 times as much photovoltaic capacity as Germany’s entire installed base, and it would have to do so every year.

Wind? Merely to keep pace with the global growth in electricity demand would require the installation of about 280,000 megawatts of new wind-energy capacity every year. According to several academic studies, the areal power density of wind energy—that is, the amount of power that can be derived from a given amount of land—is about one watt per square meter. This means that installing the requisite additional wind capacity would require covering about 280,000 square kilometers (108,000 square miles of land)—an area nearly the size of Italy—with wind turbines, every year. (For comparison, the areal power density of nuclear power is more than 50 watts per square meter. The productivity of oil and gas wells vary, but even marginal wells have power densities of about 27 watts per square meter.)  Continue reading here….

Throwing_money_at_wind_power2

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