SciDev.Net: Biofuel crops are more likely than other plants to become invasive in tropical and subtropical ecosystems worldwide, scientists have found. They say that a weed risk assessment (WRA) — which examines a plant’s biology, geographic origin, known pest status and behaviour — can be used to predict whether a species of biofuel crop will become invasive, enabling countries to avoid environmental and economic losses. In the first quantitative study of the invasiveness of terrestrial …