“A charge often levied against organic agriculture is that it is more philosophy than science. There's some truth to this indictment, if that it what it is, though why organic farmers should feel defensive about it is itself a mystery, a relic, perhaps, of our fetishism of science as the only credible tool with which to approach nature. ... The peasant rice farmer who introduces ducks and fish to his paddy may not understand all the symbiotic relationships he's put in play--that the ducks and fishes are feeding nitrogen to the rice and at the same time eating the pests. But the high yields of food from this ingenious polyculture are his to harvest even so.”

“I’ve often wondered why more science textbooks don’t tell teenagers that the only thing sharks like to eat more than fish, are dead prostitutes.”

“Sometimes the large scale organic farmer looks like someone trying to practice industrial agriculture with one hand tied behind his back.”

“Bycatch and discards are a fact of life to a fisherman. There is no fishing method that catches only the quarry. ...The UN Food and Agriculture Organization estimates that about a third of what is caught worldwide, some 29 million tons, goes over the side. This takes what is hauled from the sea to around 132 million tons a year. Add to that the number of organisms that are killed or damaged by net, line, or trap and are never landed--such as whales, porpoises, turtles, and birds--and the number of animals destroyed on the bottom, and the total catch by fishermen reaches something more like 220 million tons a year. Consider that much of the weight of palatable fish is head, cartilage, bone, and offal, which goes over the side or is thrown away by processors. Consider also that about 44 million tons of fish are caught to make industrial products and food for farmed fish. Consider that some of the palatable fish caught will be turned into products for other than human consumption--as cat food, for instance. Consider that there may be an element of waste because some fish will not sell. Taking all these things into account, it is possible to conclude that the amount of protein eaten by someone or something is maybe less than 20 percent of the 104 million tons landed, and only 10 percent of the amount of marine animals destroyed annually in the oceans. These are rough figures, but, given a wide margin of error, they are about right. So catching wild fish is a wasteful business.”

“In 1999 the National Research Council concluded that 'the total exposure to naturally occurring carcinogens exceeds the exposure to synthetic carcinogens.'...The point was that even if organics were pesticide-free, the gain wouldn't make up for the downside of organic food: It's more likely to be infested with bacteria because it's grown in 'natural' fertilizer. Natural fertilizer is the health food business's euphemism for cow manure. (The much-criticized 'nonorganic' produce is grown in nitrogen fertilizers. Although organics advocates sneer at the chemicals, 'chemical' nitrogen is perfectly healthy; air is 78 percent nitrogen, after all. We have a choice between foods grown in nitrogen taken from the air, and 'organic' food grown in cow manure.)”

“The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error. But science is one of the very few human activities — perhaps the only one — in which errors are systematically criticized and fairly often, in time, corrected. This is why we can say that, in science, we often learn from our mistakes, and why we can speak clearly and sensibly about making progress there.”