Associated British Foods (AB Foods) has cautioned that it may be forced to close its Vivergo plant, the UK's largest bioethanol producer, if the government does not intervene. The company cites a recent trade agreement with the United States that lowers tariffs on US bioethanol imports as a key factor impacting the plant's viability. AB Foods argues that the deal creates an uneven playing field, making it difficult for Vivergo to compete. The closure would result in significant job losses and negatively impact the UK's biofuel production capacity. The company is urging the government to provide support measures to ensure the plant's survival.