What The History of Fossil Fuels Teaches Us About Renewable Energy - The Atlantic - 0 views
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First, the resources. Pretty much all available energy on the earth comes from energy radiated by the sun.
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The exceptions to the sunlight rule are: geothermal energy, which comes from the very hot core of the earth (often in the form of volcanoes); tidal energy, which is the result of water interacting with the gravity of the earth, moon, and sun; and nuclear energy
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Some of these resources are renewable, but at the moment, the dominant suppliers of energy to human civilization (the fossil fuels) are not.
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Smil’s “prime movers,” which he defines as “energy converters able to produce kinetic (mechanical) energy into forms suitable for human use.” For most of the time that there have been humans on earth, the best prime movers have been people
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while Smil agrees with pretty much everyone else that the next big energy transition is from nonrenewable to renewable resources, he is cautious about the timing. At one level, the change is plainly inevitable.
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Things really kicked off with the invention of the steam engine in the 1700s—the first prime mover powered by fuels (100,000W in 1800; 3,000,000W in 1900). This was followed by the steam turbine (75,000W in 1890; 25,000,000W in 1914). The prime-mover revolution is rounded out by the internal-combustion engine in the later half of the 1800s and the gas turbine in the 1930s
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Smil is concerned with the series of transitions that have occurred throughout human history, both in terms of resources and prime movers. These transitions are somewhat interrelated, but not completely. For example, you can run a steam turbine off of wood, coal, or nuclear power so a transition between those resources does not necessitate a change in prime movers. On the other hand, you can’t feed an internal-combustion engine with wind or wood. At the moment, all of our best prime movers rely heavily on fossil fuels.
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how prime movers have increased in power over the course of history. Remember that orange lifted to a counter? If you expend that effort over a second, that's 1W (a watt) of work. Smil calculates that the average healthy human can sustain 60W–100W of work throughout a working day. At some point in prehistory, people started yoking domesticated animals (250W–800W depending on the breed). Then came sails, then a few thousand years later, waterwheels (2,000W–4,000W in medieval times) and then a thousand years after that, windmills (1,000W–10,0000W in 1900).
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The barriers to total conversion—much like the problems that plague our energy infrastructure—are a funny mixture of policy, technology, infrastructure, and physics
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Where he does differ is in his opinion about how quickly it can happen. Where Gore calls for a complete conversion to renewables in 10 years, Smil thinks the transition will take generations.
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For example, the possibility that nuclear power might take up any of the load in the U.S. seems extremely low, given that no new plants have been built since the 1970s. That’s not a physics problem, that’s a policy problem.
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As far as converting to wind and solar, Smil sees much bigger technological and infrastructural hurdles. A switch to renewables means a transition in terms of both resources and prime movers.
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The character of renewable resources is fundamentally different from that of fossil fuels. Where fuels are highly dense stores of energy and relatively easy to reliably transport, the renewables are characterized by the highly fickle ebbs and flows of nature. Some days are sunny, others have clouds.
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Energy density is sometimes used to discuss the capacity of volumes of batteries and fuel. Smil is interested instead in measuring energy per unit of the earth’s surface. He uses the figure as a means to try to compare the various means of producing energy and the demands for using it.
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to measure the energy density of coal, you look at how much energy you get from burning coal and divide that by how much of the earth’s surface needs to be given over to coal production to get it.
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Because the best way of mitigating the irregularity in how they generate power is to create interconnected grids, an energy regime based on wind and solar needs to lay a lot of power lines through a lot of jurisdictions and permitting regimes. Physics meets infrastructure, and policy. Renewables are simply more diffuse.
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“Mass adoption of renewable energies would thus necessitate a fundamental reshaping of modern energy infrastructures,” Smil writes. We'd go from harvesting energy from concentrated sources and diffusing it outwards, to gathering energy from diffuse sources and concentrating it inwards towards relatively few centers. This is, fundamentally, a very different way of organizing how we use land.
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This is not impossible, and in the long run it is probably inevitable. But we underestimate the effort required and changes that will be necessary at our peril.
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The switch from wood to coal ushered in industrialization which completely upended social-structures and human relationships all over the world. The rise of oil transformed geo-politics, turning some countries into energy superpowers overnight. No one knows how deeply our society might be transformed by the transition to renewables. Or whether we'll be able to do it fast enough.