Wow, Enviro, I don't know if it was intentional or not, but you sound a little like a true believer when it comes to the Green Party (not accusing you). For me, big platitudes and broad statements about the environment and the human interaction/relationship have to be taken with many grains of salt (which is a natural substance, but part of which is chlorine and quite harmful to humans - I'm being a smart-ass with a point).
I am not one of those individuals who thinks one has to know everything before one acts, but the choices of metaphors, ideologies, attitudes, platititudes and polemical statements can alter how an issue is approached, understood and ultimately dealt with. What I want is more clear thinking and less politicking around these issues.
Just to make a few points, and not belabour things, I think that so many of the words that float around, such as "unnatural," "sustainable" and even "environmentally friendly" for example, are loaded with meanings that differ between many people.
Do I think that some poor choices are being made with respect to the environment? Yes, that's why I want to see more research being carried out, but I want research as free as possible from unexamined and politically-loaded notions such as "unnatural," and "environmentally-friendly," because those terms can mean so much to so many people, or be meaningless altogether.
I'm talking about the human race, not human individuals as in increasing rates of athsma, more allergies, more vision defects, etc.
So we can tally up ailments, but what does this mean? What are the causes of these ailments? Are these actually numbers that are only now being reported? Have they actually been increasing in numbers? Is it a by-product of more thorough data collection, a better understanding of the nature of these ailments, a result of increased population, or too much or too little exposure to something? It's easy to collect up a bunch of problems and generate a correlation, but a correlation does not provide details or a clear understanding of causation, and for that you have to look individually many times over simply because big numbers can obscure the clear understanding of what is going on. So long as we live in the environment that we do, people will keep on being affected by it. Bacterial and viral infections are natural processes. We are natural processes, too, and only now is it being understood that natural genetic variability plays an immense role in causing many illnesses (which would by extension then be quite "natural").
I'm not talking about argiculture... I'm talking about using unnatural feed for animals, using chemicals to grow plants, and chemicals to kill pests.
I see the point you are trying to make, but my reference is to the term "unnatural." What does that mean? Sure, you may not be talking about agriculture, but it is in fact "unnatural," it is an activity only about 10,000 years old. Only people do it, and in doing so everything that follows would be "unnatural." The cattle, the pigs, the birds, the plants, the plant feeding processes, the land use, the irrigation and so on are all unnatural. The animals and plants are products of artificial selection; the land use is one of selecting only some plants to grow on selected lands, and the growing techniques are not natural. The lands are fertilized to replace nutrients and soil materials removed with the harvesting; the irrigation is a process of redirecting waterflow to these selected lands and controlling that waterflow; and there is the control of of animals and insects that would otherwise take advantage of the concentration of certain plants. My point is that we find oursleves dependant on our abilities to do the "unnatural." The call to introduce "natural" processes to farming activities sugarcoats the notion that farming will always be "unnatural" to those who want to cut clear distinctions between human activities and the world around them.