From rats, cats and mosquitoes to a rogue s gallery of plants, a major scientific assessment catalogued more than 37,000 alien species worldwide, 10 per cent of them classified as aggressively harmful, or invasive .
Invasive species that wreck crops, ravage forests, spread disease, and upend ecosystems are spreading ever faster across the globe, and humanity has not been able to stem the tide, a major scientific assessment said Monday.