The impact of Bt crops on beneficial non-target organisms became a public issue after a 1999 paper suggested they could be toxic to monarch butterflies.
Adagal wan sigyak Bt fal təɣiswen ti garawnen winan atwamaɣ eaqlana asibab ən təmite darat artiəle wan 1999 aigrawan aliɣi nas adoben adiqilan alabasan ye ɗaɗillontan arnanen.