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Power Earth

Corn Ethanol Worse for the Climate Than Gasoline, Study Finds (arstechnica.com) 173

Reuters reports: Corn-based ethanol, which for years has been mixed in huge quantities into gasoline sold at U.S. pumps, is likely a much bigger contributor to global warming than straight gasoline, according to a study published Monday.

The study, published in the Proceedings of the National Academy of Sciences, contradicts previous research commissioned by the U.S. Department of Agriculture (USDA) showing ethanol and other biofuels to be relatively green.... The research, which was funded in part by the National Wildlife Federation and U.S. Department of Energy, found that ethanol is likely at least 24% more carbon-intensive than gasoline due to emissions resulting from land use changes to grow corn, along with processing and combustion....

Under the U.S. Renewable Fuel Standard (RFS), a law enacted in 2005, the nation's oil refiners are required to mix some 15 billion gallons of corn-based ethanol into the nation's gasoline annually. The policy was intended to reduce emissions, support farmers, and cut U.S. dependence on energy imports.

"Today, most gasoline sold in the U.S. contains 10 percent ethanol, and about a third of the corn crop in the country is used to produce the fuel..." reports Ars Technica: The extra land put under the plow released a significant amount of carbon, enough to flip the assessment of corn ethanol from a carbon-negative fuel to a carbon-emitting one. The biggest decline came when new cropland released carbon that had been stored in soils and vegetation, including roots of living plants. Farmers were also less likely to enter a field into the Conservation Reserve Program, which pays farmers to plant perennial vegetation on unused farmland.

After the fertilizer was applied, it released a significant amount of nitrous oxide, a potent greenhouse gas that warms the atmosphere 300 times more than the same amount of carbon dioxide over 100 years. The researchers' estimates of the carbon impact of the fertilizer are probably low, too, since the authors didn't calculate how much additional pollution the manufacturing process released or the extent to which degraded water quality in downstream waterways released more greenhouse gases.

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Corn Ethanol Worse for the Climate Than Gasoline, Study Finds

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  • by gurps_npc ( 621217 ) on Saturday February 19, 2022 @02:42PM (#62283765) Homepage

    Anything that is nutritional enough to eat has wasted too much energy making things taste good to be efficient at creating a good fuel.

    I am fully in favor of renewable energy in general, but it is clear that we should not use something that is edible. Inedible algae makes sense, but not corn derivatives.

    • by rsilvergun ( 571051 ) on Saturday February 19, 2022 @02:56PM (#62283825)
      and you own millions of acres of land only suited to farming corn. As long as we've got a Senate, we've got ethanol in our gasoline. That's how American politics works.
      • The issue is not that it is only suited to growing corn. It could grow a number of crops, and with proper rotation they could use much less fertilizer. The problem is the subsidies that are not only harming the environment, they are actively harming the economy and have been for years. And not just the US economy, but economies in many countries. By the way, the farm bill still has to get past the House and the President. It is more an issue with our two party system than with any one body.
    • by Entrope ( 68843 ) on Saturday February 19, 2022 @03:01PM (#62283839) Homepage

      The corn used for ethanol is very different from the form usually used for human food, and much of its byproducts can be used in animal feed. Also, Brazil uses sugar cane for a much more environmentally friendly bioethanol -- because the same sugars that make it tasty for people are easy for microbes to digest.

      • The waste product from making ethanol is mostly the proteins from the corn. Cattle need protein but they also need starch and sugar. To make up for this waste food is put in with the corn proteins, things like expired chocolate bars.

        Here's an idea. Use the expired food for making ethanol and feed the unmolested corn to the cattle. The reason we feed this food to the cattle, aside from no longer being fit for human consumption, is that it is rich in high fructose corn syrup.

        Let that sink in. We tear the

        • by Entrope ( 68843 )

          Large animals can consume a lot more different kinds of foodstock than the yeast that make bioethanol, though. It's not just a question of energy balance and stoichiometry. We don't have microbes or catalysts that do what you suggest.

        • To ensure that industrial production is efficient you need inputs with known qualities. You've just suggested poisoning the ethanol production system with all sorts of other stuff. That's not very sensible.
    • by ZiggyZiggyZig ( 5490070 ) on Saturday February 19, 2022 @05:15PM (#62284159)

      I'm not in favor of biofuels in general, even if they are made from non-edible plants, plant byproducts, or whatever. All the biomass that we turn into oil is taken out of the cycle of soil regeneration, which means our soil becomes less fertile, and we then need to amend it with more and more fertilizer in order to grow our things on it. This is already a problem as we speak, soil depletion.

      I wonder if making biofuel from algae or other things we could grow in the ocean could be a more sustainable way to tackle this problem.

      • Biofuel from algae works supremely in the bench-scale, but fails miserably in the production scale. You can't just grow algae "in the ocean" if you want a high-yield process. You need to put them in a water free from contaminants, you need to feed them CO2, and you need to make sure they get enough sunlight (that one is a bitch, look up "light attenuation in water", it practically means that you can commercially grow algae only in shallow ponds). There is technology to grow algea on a ship, but it doesn't s
    • Sometimes it does (Score:5, Informative)

      by Solandri ( 704621 ) on Sunday February 20, 2022 @04:08AM (#62285015)
      All this started in the 1930s, after the Dust Bowl. For the first time, the U.S. wasn't producing enough food to feed everyone. To prevent that from ever happening again, a bunch of agricultural subsidies were implemented. This is why we pay farmers not to grow food - to guarantee that their land is available as a reserve if some disaster or blight should put other agricultural land out of commission. The government also pays farmers more than market value for their crop, then sells it to food wholesalers and supermarkets at market value.

      When you subsidize crops like this (pay higher than market price), more of it gets produced than there is demand. So every year, the U.S. ends up with a surplus of crops. The trick is to figure out what to do with all this excess food. A lot of it is turned into feed for cattle, because Americans love beef. Some of it gets turned into high fructose corn syrup, to reduce American's dependence on cane sugar imports. Some of it is turned into foreign aid and shipped overseas to countries in need of food. Then in the 1970s after the Arab oil embargo, someone came up with the idea of converting some of this excess corn into ethanol as a substitute for gasoline.

      The important thing to understand is that this is excess corn. The food has already been produced. The water, fertilizer, and labor have already been used - they are sunk costs. Not using the corn doesn't get you these consumed resources back - all it does is give rats more free food in the silos where you're storing it. So in this case, burning food does in fact make sense. (Same goes for much of the beef we eat - lowering beef consumption won't translate into a direct reduction in water, land, and fertilizer used to feed the cattle).

      However, the current corn ethanol program is totally different. It's corn which is specifically grown for the purpose of converting into ethanol. There are no sunk costs here. So it is in fact a waste of resources that the agricultural industry has foisted upon us with heavy lobbying.
  • by ickleberry ( 864871 ) <web@pineapple.vg> on Saturday February 19, 2022 @02:44PM (#62283773) Homepage
    Use an anaerobic digester to create methane & burn that in a petrol engine or use a waste product to create ethanol. Growing crops purely to turn it into fuel dosnt make sense
  • by bird ( 12361 ) on Saturday February 19, 2022 @02:45PM (#62283777) Homepage

    Let's guess that if the earliest presidential primaries were held in some other state than Iowa or similar corn-belt state, we wouldn't have this disastrous policy to begin with. BTW, it also affects food prices and not in a good way.

  • But will we stop propping up the giant corn farms and the industry that surrounds them? Doubtful.

    https://farm.ewg.org/progdetai... [ewg.org]

    https://usafacts.org/articles/... [usafacts.org]

    • Re:subsidies (Score:5, Interesting)

      by quonset ( 4839537 ) on Saturday February 19, 2022 @02:56PM (#62283829)

      But will we stop propping up the giant corn farms and the industry that surrounds them? Doubtful.

      https://farm.ewg.org/progdetai... [ewg.org]

      https://usafacts.org/articles/... [usafacts.org]

      No, because without the taxpayers footing the bill, all those multi-billion dollar companies wouldn't be able to survive due to how ineptly they are managed. It's only because of those socialist payments that they exist at all.

      It's like those soicalist policies Domino Sugar operates under to keep sugar prices high (relatively speaking). If the company was allowed to go out of business rather than being propped up by the taxpayers [nationalreview.com], the price of sugar would be half what it is now AND, instead of corn syrup (related to this article) we'd have real sugar in our drinks.

      • You keep using that word, I don't think you know what it means. The word you are looking for is lobbying. Domino Sugar lobbies the government for favorable policies.

      • by swell ( 195815 )

        "because without the taxpayers footing the bill . . ."

        Why are the taxpayers footing the bill? Pork is the answer. Farmers have vast power over elections in rural states. Congresspeople in those states are eager to be reelected. Thus they propose bills that favor their farmers. But rural Representatives are few among the hundreds of others. They can't sway the greater body of Congress to their will. But Senators have vast power. The Senator of a rural state has as much power as the Senator of the biggest sta

      • It's more like there are policies in place to ensure food is abundant and cheap in the US, as a consequence of the 1930s depression and subsequent "dust bowl." These policies heavily promote high farming production in various ways.

        However, the overabundance of staple crops like corn means the market is flooded and the price has cratered. That's not entirely unplanned since the policies are intended to keep feed cheap - which they do - but among the consequences is the crop does not have sufficient market va

  • Isn't the corn used in ethanol made from GMO corn?

    • by HiThere ( 15173 )

      That's OK once you distill it. You just don't want to eat it.

      Actually, I suspect what they used is what's called field corn, and what we called "chicken corn". You wouldn't want to try to eat it, though you can make decent grits out of it. I haven't a clue at to its GMO status these days. Back when I dealt with it, it was the cheapest corn around.

  • by Gravis Zero ( 934156 ) on Saturday February 19, 2022 @03:26PM (#62283915)

    about a third of the corn crop in the country is used to produce the fuel

    Does anyone think Republicans will agree to end this massive subsidy? I don't see it happening.

    • by seth_hartbecke ( 27500 ) on Saturday February 19, 2022 @03:51PM (#62283995) Homepage

      There has been a pretty steady decline in ethanol subsidies over the last decade. And most farmers are actually very much in support of their removal.

      The biggest "subsidy" that remains is mixing mandates. Adding a % of ethanol to your petrol gas helps it burn cleaner (less smog). Many states have a mixing mandate (so, you know some % of the pump gas sold will have to be ethanol). But the price supports and subsidies are mostly gone (at least compared to where ethanol was a decade or more ago).

      The biggest farming "subsides" that remain are programs like crop insurance programs (you document yearly your yield, and they insure 85% of your average output ... this helps small farms not fail in years there are weather related crop failures), and CRP (which pays farmers to NOT FARM acres that are environmentally sensitive to farm). If you want to question if the rates they pay for crop insurance are properly matched to the payments of the program, I'm up for that conversation. But, I'd also point out that most flood insurance programs are federally backed and equally upside down (fewer payments from the insured than cover the costs of the loss). That opens a much larger can of worms around how in MANY MANY sectors of our country we have structured "insurance" and pensions in ways that they payment out will not be covered by the payments in, and then just transferred that loss to the US Treasury.

      In Summer of 2020 there were some unusual payments after COVID wrecked the commodities market for a few months, and suddenly found themselves with commodities that they could not sell at any low price, but had payments and bills that were dependent on actually being able to move product (even if at a minor loss). Farmers know there are times they "loose money" on their products. They kinda ... build themselves to be able to handle that. But there were many stories of farmers literally with truckloads of a commodity on the road, and the truck being told to take it back to the farmer. Big difference between "I'm going to loose $x on this, but at least I can cash flow some bills" and "I just can't sell anything ... at all ..."

      • by gawbl ( 941021 )

        There has been a pretty steady decline in ethanol subsidies over the last decade. And most farmers are actually very much in support of their removal.

        The biggest "subsidy" that remains is mixing mandates. Adding a % of ethanol to your petrol gas helps it burn cleaner (less smog).

        No, not anymore.

        Back in the '70s, cars were fitted with carburetors, and the US EPA ran some studies that showed less smog if you added an oxygenate to the gasoline.

        The Ethanol (or MTBE) in the gas drags in some oxygen, making a leaner burn, if you're using a carburetor.

        If your engine has fuel injection and an oxygen sensor, the sensor detects the lean mixture and the FI system richens the mix to compensate. Bottom line, oxygenated gas (Ethanol or MTBE) yields about 3% lower mileage, with no difference i

    • by tomhath ( 637240 )
      Democrats are in control of Congress and the White House, don't blame Republicans.
  • The billions of subsidies the farmers get to produce it, the CO2 created when producing their Ammonia with natural gas alone make it a stupid idea.

    • > The billions of subsidies the farmers get to produce it, the CO2 created when producing their Ammonia with natural gas alone make it a stupid idea.

      Not to mention all the CO2 required to create/tax those billions of dollars. Imagine how many commuter miles are involved in production, before taxation, before administrative overhead, before giving it to the farmers. Shall we even mention the CO2 required to fuel the humans who are generating it? Or the CO2 required to rear these people as some number of

    • the CO2 created when producing their Ammonia with natural gas alone make it a stupid idea.

      No one gave a flying hoot about CO2 when corn ethanol was debated and chosen to fix a completely different problem than the one being faced now.

      You have a time machine and know the future? Great. Use it and go back to change things. Otherwise your perfect 20/20 hindsight is completely useless to everyone.

  • by Kelxin ( 3417093 ) on Saturday February 19, 2022 @03:33PM (#62283937)
    Every single one of these studies is biased in one direction or another. There is no motivation for a neutral party to do a study, so every study is funded by one side or the other. Each of these studies on both sides painfully omit factors that would lean it the opposite direction. This one, for instance, is how much CO2 do the crops absorb while they grow? Just as one example. I'm not saying either side is right or wrong, I'm just saying they're not fully encompassing of all of the factors.
    • A study doesn't need to be wrong to be biased. You're looking for errors when instead you should be considering that maybe the study is completely correct and the bias being produced here is purely based on finding something bad about bioethanol that we currently give a shit about. e.g. CO2 emissions, something which wasn't even remotely considered when bioethanol was considered as a petrol alternative back 2 decades ago.

      Literally nothing ever will encompass every factor and every impact. The world is too c

      • I don't think adding how much CO2 is absorbed per square acre or oxygen produced to the equation makes it overly complex for humans to handle, and that's my point. They're obviously avoiding easily calculatable factors on both sides. I guess my approach to a problem isn't "it's hurd, so must give up".
  • Corn farmers smelled money; their lobby kept yelling "cheaper, cleaner, domestic" as if this made it true. It worked - the sheeple believed, congresscritters passed laws, and we got to watch what happens when you put ethanol in a system with plumbing and seals designed to handle octane. The energy density's about 10% lower on ethanol - anybody who thinks that adding it to gasoline will make for a more efficient fuel is obviously a corn farmer.

    But, hey - we got what we wanted, right?

  • Now where is the class action where everyone gets a penny to cover the multiple small engine carburetors, fuel lines, and other parts that ethanol has ruined. Also I want my mpg back and the wasted fuel because of that. Also I want my gas to last more than a few months without absorbing water due to the ethanol - just imagine how much small engine equipment gets thrown out simply because of ethanol containing fuel that went bad and owner doesn't understand that modern fuel just doesn't sit well.

    Ethanol i
    • I try to drink some every day - my plumbing is robust enough to handle it (although in fairness, I stick mostly to whiskey).

      It's also a great solvent - I use it to clean all sorts of things (well, okay - I use denatured isopropyl alcohol for that).

      It can be used at a pinch as a clean-burning fuel (like, say, in a lamp or other non-internal combustion process).

      That's why I keep a flask full of grain alcohol in my work bag, next to the Zig-Zag rolling papers (which are both better and cheaper than manufact

      • Yes sorry I didn't specify the use case, but nice way to take something out of context. The politicians must obviously drink the stuff.
  • We've known this from the beginning so why are we still doing it? Fuck this world
    • Inediable, unsellable corn slury, makes bad beer with biological action, next you boil the bad beer, you collect and condensed the vapors, then you boil the vapors multiple times methanol (very useful feedstock to chemical companies) and ethanol. Guess what does not matter one bit to an ethonol producer, the age or smell quality of the corn, the producers buy the corn that sat in the bin for two years that even the cows turn their nose up at. Cannot be made into dog food and is not the best for plast
  • by battingly ( 5065477 ) on Saturday February 19, 2022 @05:34PM (#62284183)
    There was never any justification for this except to drive up demand for farm products for the benefit of farmers.
  • The "Meatloaf energy" idiots will do anything for global warming but they won't do "that". What is "that"? What is the thing that they won't do? They will try anything and everything but nuclear power.

    The US Navy proved that synthesized hydrocarbon fuels are a viable alternative to petroleum fuels. They proved this a decade ago. The had real world numbers to show that they could produce a net zero carbon fuel that was at the time double what people paid at the pump for gasoline.

    I expect people wanting

  • So it's actually worse than regular gasoline, but in fact it's also worse as it deteriorates much faster, you can't have it sit in your cannister for more than a year, hell even half a year, after that it just gets sluggish and is very bad for any engine. Also it eats much faster through rubber valves and such. Also makes the gastank corrode much faster inside (just had to replace my gastank due to major corrosion).
    • Ethanol and water in a wood container is directly drinkable after 30 years, glass container is drinkable after 200 years.

      If you showed as much care for 85% ethanol as I do for 40% (80 proof) single malt you would not have a problem.

      All other problems with Ethanol can be solved by using the proper gasket, flexable line and o'ring materials.

      The food stuffs that are made into Ethanol would be food waste otherwise.
  • You can't compare grown biofuel to fossil fuels. The biofuel is grown, partially offsetting carbon omissions, with the benefit of being renewable. The gasoline is not renewable.

    This is what's missing from the calculations: biofuel is renewable, fossil fuels aren't.

  • US total Corn production has doubled since 1978. The price adjusted for inflation has halved. The bottom of the market is supported by ethanol producers buying when other demands are low and for the united states that is a good thing.

    Corn grain yields in the U.S. have steadily increased since the 1950's at almost 2 bushels per acre per year. The variance between years is 1 billion bushels just for US producers, that is about 30%.

    The volume on the world corn market is typicaly slim unless disaster has h
  • It's positioning in the schedule of primaries is extremely significant as to why ethanol is used to the degree it is, and it also serves to weed out those who don't care to be part of a great hypocrisy, and fraud. Can't have that kind winning!

    It's like joining a tribe that mandates cannibalism as part of the initiation. When you're in you're in.

    https://www.uspresidentialelec... [uspresiden...onnews.com]

  • In the beginning it was a program to divert unmarketable corn in the stuff not fit for even animals to eat. Instead of a waste diversions program when ended up replacing food crop land for corn. Honestly why we just don't find a way to deal with the pig shit first instead of growing more corn which is about the only crop that can utilize those high levels of fertilizer.
  • This is not new. The problem is that corn farmers really like free money, and congress really likes farm votes.

Air pollution is really making us pay through the nose.

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