Since no plausible evidence has yet emerged of risks to human health from eating GM food, the environmentalists' main remaining objection is that GM plants may cross-pollinate others, spreading their alien genes to other species with unpredictable environmental effects.

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Prof Thompson said the plastics had been found "in relatively low quantities - one or two pieces per fish - so this is certainly not a risk from the point of view of the human population, people eating those fish, because of course we don't eat the guts normally".

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It's this interest in meat where it comes from how the animals are treated before they become meat, whether or not we, as human beings, should be eating meat at all, what meat suggests about our own mortality, about - the ethical questions we all or many of us struggle with.

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This is a form of prejudice which unduly favours the human species and seems to justify its members in exploiting, eating and experimenting on other animals for their benefit.

ECONOMIST: Moral arguments: Animals too | The

Behavioral errors, such as a dieter irrationally eating a box of doughnuts, are more insidious since they are rooted in deep-seated human behaviors.

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Mr Paterson dismissed concerns about human health, arguing that widespread use of GM crops around the world meant people were already unwittingly eating GM food.

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