 Some have challenged the value of the increased food production of Green Revolution agriculture.Miguel A. Altieri, (a pioneer of agroecology and peasant-advocate), writes that the comparison between traditional systems of agriculture and Green Revolution agriculture has been unfair, because Green Revolution agriculture produces monocultures of cereal grains, while traditional agriculture usually incorporates polycultures.These monoculture crops are often used for export, feed for animals, or conversion into biofuel.