Invasive Alien Species Subject: Environment Section: Biodiversity Context- Invasive alien forest insects will kill 1.4 million urban trees in US by 2050: Study. Concept- Invasive alien forest insects will kill 2.1-2.5 per cent of all street trees (1.4 million) in the United States in 30 years (2020-2050). This loss would cost $30 million […]