Likewise, animals on organic farms are not generally healthier. A five year US study showed that organic health outcomes are similar to conventional dairies. The Norwegian Scientific Committee for Food Safety found no difference in objective disease occurrence. Organic pigs and poultry may enjoy better access to open areas, but this increases their load of parasites, pathogens and predators. Meanwhile the organic regulation against feeding bee colonies with pollen supplements in low-pollen periods along with regulation against proper disinfection leads to sharply lower bee welfare.

Organic farming is sold as good for the environment. This is correct for a single farm field: organic farming uses less energy, emits less greenhouse gasses, nitrous oxide and ammonia and causes less nitrogen leeching than a conventional field. But each organic field yields much, much less. So, to grow the same amount of wheat, spinach or strawberries, you need much more land. That means that average organic produce results in the emission of about as many greenhouse gasses as conventional produce; and about 10 per cent more nitrous oxide, ammonia and acidification. Worse, to produce equivalent quantities, organic farms need to occupy 84 per cent more land land which cant be used for forests and genuine nature reserves. For example, to produce the amount of food America does today, but organically, would require increasing its farmland by the size of almost two United Kingdoms. That is the equivalent of eradicating all parklands and wild lands in the lower 48 states.

But surely organics avoid pesticides? No. Organic farming can use any pesticide that is natural. This includes copper sulphate, which has resulted in liver disease in vineyard sprayers in France. Pyrethrin is another organic pesticide; one study shows a 3.7-fold increase in leukaemia among farmers who handled pyrethrins compared to those who had not.

Conventional food, its true, has higher pesticide contamination. Although it is still very low, this is a definite benefit of organics. However, using a rough upper estimate by the head of the US Food and Drug Administrations Office of Toxicology, all conventional pesticide residues may cause an extra 20 cancer deaths per year in America.

This pales in comparison to the impact of organics. If all of the United States were to go organic, the cost would likely be around $200 billion annually from lower productivity. This is money we cant spend on hospitals, pensioner care, schools, or infrastructure.

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