Seven Myths about Alternative Energy: As the World Looks around Anxiously for an Alternative to Oil, Energy Sources Such as Biofuels, Solar, and Nuclear Seem like They Could Be the Magic Ticket. They Re Not

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"We Need to Do Everyhing Possible to Promote Alternative Energy."

Not exactly. It's certainly clear that fossil fuels are mangling the climate and that the status quo is unsustainable. There is now a broad scientific consensus that the world needs to reduce greenhouse gas emissions more than 25 percent by 2020--and more than 80 percent by 2050. Even if the planet didn't depend on it, breaking our addictions to oil and coal would also reduce global reliance on petrothugs and vulnerability to energy-price spikes.

But though the world should do everything sensible to promote alternative energy, there's no point trying to do everything possible. There are financial, political, and technical pressures as well as time constraints that will force tough choices; solutions will need to achieve the biggest emissions reductions for the least money in the shortest time. Hydrogen cars, cold fusion, and other speculative technologies might sound cool, but they could divert valuable resources from ideas that are already achievable and cost-effective. It's nice that someone managed to run his car on liposuction leftovers, but that doesn't mean he needs to be subsidized.

Reasonable people can disagree whether governments should try to pick energy winners and losers. But why not at least agree that governments shouldn't pick losers to be winners? Unfortunately, that's exactly what is happening. The world is rushing to promote alternative fuel sources that will actually accelerate global warming, not to mention an alternative power source that could cripple efforts to stop global warming.

We can still choose a truly alternative path. But we'd better hurry.

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"Renewable Fuels Are the Cure for Our Addiction to 0il."

Unfortunately not. "Renewable fuels" sound great in theory, and agricultural lobbyists have persuaded European countries and the United States to enact remarkably ambitious biofuels mandates to promote farm-grown alternatives to gasoline. But so far in the real world, the cures--mostly ethanol derived from corn in the United States or biodiesel derived from palm oil, soybeans, and rapeseed in Europe--have been significantly worse than the disease.

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Researchers used to agree that farm-grown fuels would cut emissions because they all made a shockingly basic error. They gave fuel crops credit for soaking up carbon while growing, but it never occurred to them that fuel crops might displace vegetation that soaked up even more carbon. It was as if they assumed that biofuels would only be grown in parking lots. Needless to say, that hasn't been the case; Indonesia, for example, destroyed so many of its lush forests and peat lands to grow palm oil for the European biodiesel market that it ranks third rather than 21st among the world's top carbon emitters.

In 2007, researchers finally began accounting for deforestation and other land-use changes created by biofuels. One study found that it would take more than 400 years of biodiesel use to "pay back" the carbon emitted by directly clearing peat for palm oil. Indirect damage can be equally devastating because on a hungry planet, food crops that get diverted to fuel usually end up getting replaced somewhere. For example, ethanol profits are prompting U.S. soybean farmers to switch to corn, so Brazilian soybean farmers are expanding into cattle pastures to pick up the slack and Brazilian ranchers are invading the Amazon rain forest, which is why another study pegged corn ethanol's payback period at 167 years. It's simple economics: The mandates increase demand for grain, which boosts prices, which makes it lucrative to ravage the wilderness.

Deforestation accounts for 20 percent of global emissions, so unless the world can eliminate emissions from all other sources--cars, coal, factories, cows--it needs to back off forests. That means limiting agriculture's footprint, a daunting task as the world's population grows--and an impossible task if vast expanses of cropland are converted to grow middling amounts of fuel. …