The number of invasive alien species is increasing at “unprecedented” rates, and more than 3,500 of these are harmful, causing biodiversity loss and threatening ecosystems around the world, a United Nations-backed report says.The report by the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES), warned that the increase of invasive alien species and their negative impacts are likely to grow in the coming years and pose a serious threat to ecosystems, food security and livelihoods around the world.The team of 86 researchers from 49 countries released a four-year assessment of the global impacts of invasive species, finding that economic costs now total at least $423bn every year, with the alien invaders playing a key role in 60 percent of recorded plant and animal extinctions.
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