Ethanol has
made its way into the global markets and has been adopted my automobile makers.
Being ethanol has the advantage of having a partial acceptance by consumers and
the auto industry it does make sense to continue to develop that technology.
The biggest
issue with ethanol in America is the source used to make it. As far as the
amount of gallons per acre that can be produced by a plant, corn is very
inefficient. This directly causes farm land prices to go up. Other plants like
hemp, switch grass, and sugar cane are far more efficient than corn. In
addition, corn requires a lot more fertilizers to grow which can pollute out
lakes, streams, and ground waters. Plus, using corn, which is a primary food
source for people, raises food costs and lowers humanitarian aid. Mother Jones
has an interesting flow chart that shows the effect of using corn as a fuel
source.
Why do we,
as a country, use corn for ethanol production when there are so many better
sources out there? Sugar ethanol burns over twice as clean as corn ethanol, and
cellulosic ethanol from sources like switch grass, hemp, and forestry waste, burns
over 4 ½ times cleaner. Right now, we could import ethanol made from sugar cane
directly from Brazil for much cheaper than we could produce ethanol from corn.
Our government, however, chooses to tax those ethanol imports so much that they
no longer make good economic sense. Some scholarly discussions have implied
that this taxation is being done to keep the prices of corn in America
artificially high.
I came across
another blog article by Ali Sakhtur, entitled Brazilian ethanol is the best hope for replacing oil, says BP’s Bob
Dudley. In this article Sakhtur says that “
Ethanol derived from
Brazilian sugar-cane offers the best hope of replacing oil as the world’s main
source of fuel when it runs out, according to Bob Dudley, BP’s chief executive.
[…] The alcohol extracted from sugar cane is cheaper, less polluting and more
efficient than that from corn, for example, produced in the US. […] Brazil also
has a huge advantage in relation to its competitors. The climate and soil are
ideal and the sugarcane crop does not have to compete for areas with food crops,
as happens in the case of America. […] BP is channelling its research into
renewable fuels accordingly, with 40pc of its $1bn (£625m) annual spend in this
area targeted at Brazilian ethanol, Mr Dudley told the weekly Brazilian news
magazine Veja.
Below is a chart that the EPA put out. It shows the difference
of greenhouse gases that are emitted when creating an equivalent amount of
energy, compared to gasoline.
As you can
see in the chart, switching to an ethanol made from corn does create 21.8% less
greenhouse gases which is great. Ethanol made from sugar reduces the amount of
greenhouse gases by more than twice that of corn, at a rate of 56% reduction. However,
using ethanol that was made from a cellulosic plant source (such as hemp, switch
grass and forestry waste) has the biggest effect and reduces the amount of
greenhouse gases emitted by 90.9%.
Switch grass
is another excellent cellulosic source for making ethanol, much like hemp is.
I’ve scoured the internet and cannot find any good reason why we are not using
switch grass for making ethanol. It seems to have been dismissed as a crop all
together.
According to
Biello, “[switchgrass] ethanol delivers 540 percent of the energy used to
produce it, compared with just roughly 25 percent more energy returned by
corn-based ethanol according to the most optimistic studies. […] Vogel and his
team report this week in Proceedings of the National
Academy of Sciences USA that switchgrass will store enough carbon
in its relatively permanent root system to offset 94 percent of the greenhouse
gases emitted both to cultivate it and from the derived ethanol burned by
vehicles. Of course, this estimate also relies on using the leftover parts of
the grass itself as fuel for the biorefinery”.
Switchgrass
doesn’t need prime farm land to grow either, so it doesn’t compete with food
crops for land. Biello states that we could use the “[more] than 35 million
acres (14.2 million hectares) of marginal land that farmers are currently paid
not to plant under the terms of USDA's Conservation Reserve Program”.
Hemp would
be a great option for cellulosic ethanol production because it grows really
fast, it burns much cleaner than corn, and it produces a lot more gallons per
acre than corn. Unfortunately though, industrial hemp is classified as an
illegal drug by the Drug Enforcement Agency, despite its very low THC levels.
You couldn’t get high off of industrial hemp if you tried. This forces us to
import hemp, in which case it gets taxed at a much higher rate than it would if
it was grown right here in the U.S.
I agree that we need to move off of fossil fuels and onto renewable fuel sources. Ethanol is a great start to this and has a lot of potential. I just don't agree with using our food sources for fuels. We could start importing ethanol derived from sugar right now, and then start moving to a cellulosic ethanol source like switch grass or industrial hemp.
Works Cited:
Mad Money: The Best Trade on Ethanol. CNBC.
28 Jul 2010. Edit. Tom Brennan, Perf. Jim Cramer. 9 Apr. 2011. < http://www.cnbc.com/id/38448335/The_Best_Trade_on_Ethanol_Growth
>
Shakhtur,
Ali. “Brazilian ethanol is the best hope for replacing oil, says BP’s Bob
Dudley”. 16 Feb 2011. 9 Apr. 2011. < http://alishakhtur.com/2011/02/16/brazilian-ethanol-is-the-best-hope-for-replacing-oil-says-bps-bob-dudley/
>
Biello, David. “Grass Makes Better Ethanol than Corn Does”. 8 Jan 2008. Scientific
American. 9 Apr. 2011. < http://www.scientificamerican.com/article.cfm?id=grass-makes-better-ethanol-than-corn
>
“Greenhouse Gas Impacts of Expanded Renewable and
Alternative Fuels Use”. Apr 2007. Environmental Protection Agency. 9 Apr. 2011. < http://apps1.eere.energy.gov/news/pdfs/greenhouse_gas_impacts.pdf >
Jones, Mother. “The Corn Ethanol Effect”. Diminishing Marginal Utility.
6 Nov. 2007. 9 Apr. 2011. < http://www.diminishingmarginalutility.com/blog/hydrocarbon_issues/ >
No comments:
Post a Comment