Here the system comes into conflict with conventional agriculture and economics.
But the focus has been shifting lately from food safety to questions about the effects of modified crops on conventional agriculture.
They grow on mostly poor soils, which do not support conventional agriculture.
Crawford believes his radical approach can challenge conventional agriculture.
In conventional agriculture, chemical fertilizers are used to promote larger yields and protect against disease.
Many advocates of organic produce consider conventional agriculture to be harmful to the environment and to human health.
Consider the case of a conventional (see conventional agriculture) apple farmer.
Less than one-fifth of Austria is arable and suitable for conventional agriculture.
But the orang-utans are telling us something important about how many human beings could be supported by a world without conventional agriculture.
Multiple studies have looked at the environmental impact of conventional agriculture versus the local food movement.