We can cut carbon emissions by one third by replacing fossil fuels with renewable energy sources for electricity and heat production." –Lester R. Brown, Janet Larsen, Jonathan G. Dorn, and Frances Moore, Time for Plan B: Cutting Carbon Emissions 80 Percent by 2020
The key to restoring climate stability is shifting from a fossil-fuel-based energy economy to one based on renewable sources of energy and hydrogen. Advancing technologies in the design of wind turbines that have dramatically lowered the cost of wind-generated electricity to the point where it can be used to produce hydrogen from water, along with the evolution of fuel-cell engines, have set the stage for a dramatic restructuring of the world energy economy. The good news is that this shift is under way. The bad news is that it is not happening nearly fast enough to avoid a climate-disrupting buildup in atmospheric CO2 levels.
The burning of each of the three fossil fuels is now either growing slowly or declining. From 1995 to 2001, the use of oil, the world’s leading source of energy, expanded by just over 1 percent a year. Natural gas, the cleanest and least climate-disruptive of the three fossil fuels, grew by less than 3 percent a year.
The burning of coal, the dirtiest and most carbon-intensive fossil fuel, peaked in 1996 and has dropped by 6 percent since then. This historical peaking, marking the first decline in the use of a fossil fuel, may be followed by a similar peaking in oil use within the next 5–15 years.
In contrast, renewables, starting from a small base, are growing at an extraordinary pace. Worldwide, wind electric generation grew by 32 percent a year from 1995 to 2001. (See Table 1–8.) In 2001 alone it grew by a robust 36 percent. And in the United States, wind electric generating capacity jumped by a phenomenal 66 percent in 2001.
Solar cell sales, growing by 21 percent a year from 1995 to 2001, are likely to grow even faster in the years ahead. Once economically competitive only when used in satellites and pocket calculators, solar cells are now becoming competitive for residential lighting in Third World villages not yet connected to the grid. In many countries, if getting electricity to villages means building both a centralized power plant and a grid to deliver the power, it is now often cheaper for families simply to install solar cells. In Andean villages, for example, the monthly installment cost (with a 30-month payment period) on an array of solar cells to provide lighting is comparable to the cost of candles. A similar price relationship exists for the more remote villages in India that depend on kerosene lamps for light.
Another renewable source, one with a largely overlooked potential, is geothermal energy, which is growing at 4 percent a year. This is a vast resource and one that is likely to figure prominently in the energy economies of the Pacific Rim, particularly where widespread volcanic activity indicates that geothermal energy is close to the earth’s surface. The western coasts of South America, Central America, and North America have an abundance of geothermal energy. Perhaps the geothermally richest region is the western Pacific, including Indonesia, the Philippines, Japan, and the eastern and southern coasts of China. Another rich region is the Great Rift Valley, which stretches through East Africa up into the Middle East. In fact, the entire eastern Mediterranean is geothermally well endowed. Some countries have enough geothermal energy to meet all their electricity needs.
Hydroelectricity, which supplies over one fifth of the world’s electricity, has expanded by 2 percent a year since 1990. In contrast to the other renewable sources of energy, the growth in hydropower is losing momentum as suitable sites for new dams are scarce and as public opposition mounts to large-scale inundation of land, the associated displacement of people, and the disruption of ecosystems.
One of the difficulties in restructuring the energy economy is that doing so typically depends on small, fledgling industries challenging large, well-established, often heavily subsidized industries. One way to accelerate the restructuring needed to stabilize climate is to adopt full-cost pricing, requiring that those using energy pay the full cost of doing so. This approach is discussed further at the end of this section.
Fortuitously, the fastest-growing fossil fuel is natural gas, which is the obvious transition fuel from a carbon-based energy economy to a hydrogen-based one. The natural gas infrastructure, including distribution networks and storage facilities, can easily be adapted for hydrogen as gas reserves are depleted.
As the effects of climate change become clearer, the public’s desire to avoid extreme climate events will intensify. As this happens, pressure to raise carbon taxes and reduce income taxes may well rise, providing a strong economic incentive for energy restructuring.
The new century is bringing new directions in the world energy economy. The last century was characterized by the globalization of energy as oil emerged as the leading energy source. Indeed, the entire world became heavily dependent on one region, the Middle East, for a disproportionately large share of its energy. Now as the world turns to wind, solar, and geothermal as the primary energy sources and to hydrogen as an end-use fuel, the energy economy is localizing, reversing the trend of the last hundred years.
Table 1-8. Trends in Energy Use, by Source,
Geothermal power 1
1 Data available through 1999.
Table 1-8. Trends in Energy Use, by Source,
Excerpted from Part 1, “The Economic Costs of Ecological Deficits,” in Lester R. Brown, The Earth Policy Reader (New York: W.W. Norton & Company, 2002), available for free downloading and purchase at www.earth-policy.org/books/epr.