English to French Science Environment & Ecology

"What happens when a biotech cornfield, a conventional cornfield and an organic cornfield are planted side by side ? Because agricultural systems are dynamic, any system that a grower chooses may have some impact on neighboring systmes.[...] The health and safety of biotechnology products is not an issue: the food, feed and environmental safety of the products must be demonstrated before they enter the agricultural production system and supply chain. Today, coexistence is strictly a perceived issue"

Bonjour,

Dans ce passage, je ne vois pas bien comment traduire la dernière phrase....Toutes vos suggestions seront les bienvenues !