Doctor Jimmy said:
It's called natural selection; the thing that is decided by evolutionary traits and "survival of the fittest," and has been done without human intervention for billions of years.
Umm, yes. But what we're talking about here isn't natural selection--it's artificial selection. Humans have been doing this for thousands of years. When you cultivate a crop, you place it in an artificial habitat where humans--not the wild--are in control of how it reproduces. Crop plants are not produced by natural selection; because humans control their reproduction, they also select for the traits that they want. So yes, it's called "natural selection"... if you're not talking about cows or something.
Doctor Jimmy said:
It's also called extinction; the thing that is decided by human recklessness, and is what killed the dodo bird. OK, so maybe we won't directly kill another species. But if corn is insect-repellent, and insects need this corn to live, where do you think they'll find food? Another corn patch? Even then, these insects aren't existing where the repellent corn is. And other species need these insects to survive. If they go extinct because they can't feed off our corn, then we have a serious problem.
Extinction is caused by many, many, many other things than human recklessness. It's a grand old tradition that's been going on for tens of millions of years, which is why you don't see trilobites or pterodactyls nowadays. I believe that humans should attempt to reduce their impact on the biosphere, which does mean that it would be beneficial to be considerate when producing genetically modified foods. However, here you again ignore that foods have been bred for insect resistance for a very, very long time. While we can generate insect resistance faster with genetically modified foods, this is largely irrelevant because we already do our best to prevent insects from eating crops as it is in the form of pesticides. Would you rather we continue to spray a large quantity of toxic chemicals on fields in order to reduce insect damage, or create crops that can produce their own repellents and reduce the need for pesticides? Or, alternatively, letting the bugs take what they want and dramatically reduce food production, causing worldwide shortages?
However, I wouldn't worry about the insects. So far as I know of, there are none that survive solely on crops. Why? Because of the way that humans cultivate them. Cultivated food doesn't provide a good niche because, first, there's relatively little of it. It's hard to get a species going when all you've got are scattered patches of cultivated land containing high densities of species that exist nowhere else because, as before, they require humans to help them grow and reproduce. Further, these species are pretty heavily defended in terms of pesticides and so forth, making them difficult to exploit. Finally, these resources are inconsistent--for reasons of crop rotation and simple market pressures, farmers don't grow the same crops year to year. Therefore, if you're an obligate cornivore, you're out of luck when Farmer Bill decides that soybeans are the way of the future.
Thus, the species that live off food cultivated by humans have to be generalists, able to exploit pretty much whatever's out there. Insects that eat corn also eat other things. They already wouldn't be able to sustain themselves if they did otherwise. Reducing their ability to feed off corn is not going to cause a collapse of that species because it has to have other food sources to turn to. Unstable environments like farms favor the development of generalist species that can adapt quickly to change, not extremely specialized forms that are going to get wiped out because they can no longer feed on a specific crop plant.
Doctor Jimmy said:
Our food may be genetically modified as it is now, but how will it turn out in the next hundred years or so? The effects of imbreeding, for example, doesn't happen over a single generation; it's done repeatedly. I think that repeatedly modifying this corn can cause something to happen later down the road. Just like how pugs have breathing problems now because of generations of modification, I think that corn will suffer something similar. So if we stop the GMOs now, then maybe we won't have this problem.
You can't tell what will happen with any species a hundred years down the line. Genetically modified foods are no different than any other crop/livestock/non-domesticated species in that regard. What do you think could happen that a) could not be foreseen by appropriate testing, b) would be as a result of human intervention and not natural variation caused by, say, mutation, and c) would be a serious threat to the biosphere?
Nothing is certain when a new mutation hits the scene--whether it will be the next big thing, or whether it will cause the species that possesses it to decrease in fitness. This is true whether the mutation is natural or caused by human influence. I fail to see how genetically modified foods are worse in this department than any other species, except that we're trying to make them "stronger" than the environment. However, we've always been doing this with the production of food crops.
The thing about pugs essentially boils down to "if people don't do stupid things, bad stuff won't happen." Inbreeding is bad news in any species. But if we hadn't domesticated dogs in the first place and practiced selective breeding, pugs wouldn't exist at all. I don't understand what you mean by "corn will suffer something similar." It's not like all the corn in the world is going to be replaced by
one single strain of genetically modified corn produced by a lab--genetic diversity is important for any species, even if we were to entertain the idea that this were possible enough to be a remotely plausible eventuality. I also don't understand what you're afraid of, here. That some corn might develop a genetic deficiency as a result of tampering and therefore be less productive or something? If that's the case, then you don't allow that corn to reproduce--same way it's been done for ages. It's not like inbreeding in pugs is a difficult problem to fix; people can choose to not inbreed them. It's a huge problem for people for whom pedigree is a big issue, I suppose, but with food that's not so much an issue. All I see here is a very easy fix for an unlikely situation that would only arise out of mismanagement in the first place.
Overall, just what do you think genetically modified food is going to do to the biosphere? How is it so different from "regular" cultivated food
that has already been tampered with? If you intend to pursue this line of reasoning, then I'm not going to be able to accept "genetically modified corn is bad" unless you are willing to acknowledge and argue that this translates to "all corn is bad," because as already stated, all corn is genetically modified.
Doctor Jimmy said:
You can read about it loads of places, but here's a nice article:
http://www.sciencedaily.com/releases/2005/06/050603074643.htm
In general, Googling "corn" and "teosinte" should get you all the results you need.
Teh Ebil Snorlax said:
On the contrary, in the months following the introduction of genetically modiefied soya to Britain, the amount of people in Britain with an allergy to soya rose sharply. I was in a debate about GM food a few months back and this was a point one of my teammates used, I can't quite remember the source.
I wasn't able to find a ton of scholarly work on this subject. I'm not sure that you'll be able to see the full text for the links that I give, because a lot of these are provided through databases to which my university subscribes, but I'll post the links and relevant text anyway:
From the
Journal of Experimental Botany, 2003 (
http://jxb.oxfordjournals.org/cgi/reprint/54/386/1317):
Biotechnology critics have claimed that an apparent rise in the
number of soybean allergic individuals in the UK is correlated
with the development of GM soybeans for the American market,
however, there is little GM soybean availability in the UK and
therefore little exposure. The soybean sensitivity increases are
more easily explained by the recent acceptance and wide
availability of soybean products and processed foods in the UK
marketplace. As a result of consumption, the soybean-sensitive
component of the population is being identified that will likely
peak with the same population fraction as seen in the US. These
people will need to practise avoidance of soybean products in
order to minimize adverse reactions. The primary GM soybeans
grown in the US are herbicide-resistant. Experiments have
directly tested the allergenicity of herbicide-tolerant soybeans
using immunological tests with samples from soybean-sensitive
people. These assays have shown that herbicide-tolerant GM
soybeans do not present any measurable differences in
allergenicity compared with non-GM soybeans (Burks and
Fuchs, 1995) and are, therefore, substantially equivalent by
allergenic criteria. Sensitive people remain allergic to GM
soybeans, but there is no additional allergenic risk to others.
Thus, the rise in soybean allergies was not attributable to the GM species; rather, because more soybeans were being consumed, more people who were unaware of their allergy and were finding out about it, rather than people who would ordinarily be able to eat soybeans just fine being allergic to these particular crops. Soybeans naturally have a high rate of allergenicity.
A very recent study that finds no significant difference in allergenic potential for GM vs non-GM soya:
http://content.karger.com/ProdukteD...ikelNr=102611&Ausgabe=233084&ProduktNr=224161. You can't read the full text, but the conclusion is at the bottom of the abstract. "Soybean endogenous allergen expression does not seem to be altered after genetic modification."
This is an interesting article about GM foods in the UK; I'm pretty sure that you can get to it with the public link:
http://www.pubmedcentral.nih.govarticlerender.fcgi?artid=1299063. Doesn't talk much about soya in particular, save for mentioning this:
...but not in Europe,
where contention continues despite the
fact that millions of US citizens eat GM
soya without any ill effects in a very litigious
society, and many Europeans have
eaten GM soya while in the US without
any adverse consequences.
Teh Ebil Snorlax said:
I think that genetically-modified foods such as the high-yield ones that opal mentioned are a good way to bolster a starving country but for long-term self-sustainability, they're unsuitable. The main reason for this is that the companies that produce GM foods do not allow farmers in these countries to keep the seeds of the fruit or vegetables. This is mainly done through the use of "traitor" or "terminator" genes. The more common of the two, "terminator" genes work by having the plant produce sterile seeds. In other words, these plants will not be back.
You know why this is? Because of this:
Teh Ebil Snorlax said:
When seeds from GM crops are transported, whether by insect, animal, wind or water, they can breed with non-GM crops. Without their knowledge, the farmers' plants have become contaminated and they're product is compromised, if they're marketing as organic or fresh homegrown or straight from the farm or whatever, and it's discovered their plants are contaminated with GM DNA, they can be fined for false marketing and they're entire crop will have to be pulled back. All products created from processing the crop will have to be recalled, the chain effect will require either the farmer or the government to pay out compensation for lost profits and the GM grower will never have to pay a cent. Even if they're grown in a secure subterranean bunker, the GM seeds will find their way out into the world and into non-GM plants and there really is no way to contain them.
GM plants that are designed to be self-terminating are made that way in order to prevent the interbreeding that you're worried about. If there are no seeds, there are no seeds to be transported. I also fail to see how seeds kept in a subterranean bunker are going to find their way out into the world except through human carelessness. It's not as though they have legs, although that's sort of besides the point. There are clearly ways to prevent GM plants from hybridizing with other populations; you mentioned one yourself.
Even in developed countries, genetically-modified foods are not a viable source of food, because they interfere with other non-GM producers.
I fail to see how this makes them non-viable. It suggests that there must be precautions taken in introducing them, but it's not as though GM crops stop being food because they have the potential to interbreed with strains grown on other farms.
Teh Ebil Snorlax said:
As I said while debating this, the answer is a plant that many of you are familiar with but few of you have eaten; hemp. Hemp contains all the necessary fatty and amino acids for survival, including those that the body cannot produce itself. It has a very high yield, it producing three to four yields a year. And it can be produced without leaving the ground fallow because as it is grown, hemp makes the ground more fertile, rather than less. Hemp can be processed into almost any kind of food substitute, it's more diverse than soya. Hemp can not only be grown in almost any climate concievable on Earth, but apart from food, it has numerous applications which would also aid poor countries, it has medicinal properties, it can be made into clothing and when mixed in a fifty:fifty ratio with limestone, forms hempcrete, which is cheaper, stronger and lighter than concrete. So, while GM foods may be a good, short-term solution, the long-term solution, in my opinion, is hemp.
Why not GM hemp? It's not like "GM" and "hemp" are somehow mutually exclusive terms. If you like hemp as a solution to whatever, that's fine. However, using a lot of hemp for stuff doesn't not mean using GM products for a lot of stuff at the same time.