To balance the budget you can spend less or tax more. The Republicans are allergic to tax increases, and since their capture of the House of Representatives in November’s mid-term elections have succeeded in focusing the debate almost exclusively on what should be cut. One bit of spending that has caught the eye of Tom Coburn, the Republican senator for Oklahoma, is the $6 billion a year the government doles out in tax breaks to refiners who blend ethanol into their petrol. By general consent, this is not money well spent. Farmers may relish receiving taxpayers’ money to grow the corn that goes into ethanol, but corn-based ethanol is not the green fuel it is cracked up to be. Almost as much energy is used to make it as when it is burned. Here, you would think, is one subsidy that any Republican fiscal conservative in his right mind would want to get rid of.

The reason it may be desirable to use car gas in a small plane is
A) cost
B) reduced problems that come with using unleaded gas (fouled spark plugs).

The fact that corn-ethanol production has continued to grow, despite the failure of a number of firms in late 2008 and early 2009, points to the efficacy of the various protections and subsidies it enjoys (falling maize prices helped too), though it says nothing about their efficiency or wisdom. Ethanol, which is used mainly as an additive to petrol, is not a particularly good fuel: it offers only about two-thirds as much energy as petrol and can corrode pipelines and car engines. By 2014 or earlier, ethanol production is expected to reach 10% of America’s total fuel demand, and thus to hit a “blend wall”, since the EPA does not at present allow blends of more than 10% for mainstream use.”

HOW green is ethanol? The Renewable Fuels Association (RFA), an American lobby for the stuff, obviously wants voters and politicians to think it is very green indeed. The association’s cool-coloured website plays down claims that ethanol may actually harm the environment. The biggest target of those claims these days is that growing maize to make ethanol causes indirect changes in land use by altering the incentives of other, often foreign, farmers.
Adding ethanol to the traditional markets for maize (food and fodder) inevitably pushes the price up. That encourages farmers, including those in poor countries, to boost production. If some of those farmers plough up savannah or cut down forest to grow the extra crops, the carbon dioxide released from the plants destroyed and soil ploughed up reduce the benefits of substituting the ethanol produced for petrol. If forests that are still growing are cleared, the environment loses the effect of their future uptake of carbon dioxide, too.

The benchmark paper on this, published in Science in February 2008, argues that, if such changes in land use are taken into account, ethanol is twice as carbon-intensive as petrol in the short run. Making ethanol and burning it in a car (without land changes) emits 20% less carbon dioxide than refining and burning petrol. But planting a hectare of ethanol causes someone to clear land for food crops elsewhere. That ethanol crop must provide that modest 20% reduction for 167 years to achieve a net carbon reduction. By then, of course, it is far too late to mitigate climate change.

THURSDAY, MAY 7, 2009

STANFORD, CA – Biofuels such as ethanol offer an alternative to petroleum for powering our cars, but growing energy crops to produce them can compete with food crops for farmland, and clearing forests to expand farmland will aggravate the climate change problem. How can we maximize our “miles per acre” from biomass? Researchers writing in the online edition of the May 7 Science magazine say the best bet is to convert the biomass to electricity, rather than ethanol. They calculate that, compared to ethanol used for internal combustion engines, bioelectricity used for battery-powered vehicles would deliver an average of 80% more miles of transportation per acre of crops, while also providing double the greenhouse gas offsets to mitigate climate change.

In Brazil, for instance, only a tiny portion of the Amazon is being torn down to grow the sugarcane that fuels most Brazilian cars. More deforestation results from a chain reaction so vast it’s subtle: U.S. farmers are selling one-fifth of their corn to ethanol production, so U.S. soybean farmers are switching to corn, so Brazilian soybean farmers are expanding into cattle pastures, so Brazilian cattlemen are displaced to the Amazon. It’s the remorseless economics of commodities markets.

Ethanol: A Few Myths Debunked

To be honest, there are so many misconceptions and myths in the article that a better name for it would have been Ethanol: A Few Myths Repeated. I think all of these “myths” have been covered at one time or another in this blog, but he does quote Vinod Khosla at length. So, this might be a good time to re-debunk Khosla, given that he has repeated this claims many times since the first debunking.

So, once again, here are Vinod Khosla’s claims, repeated from the above article, dissected and debunked.