OSLO (Reuters) - Animals and plants brought to Europe from other parts of the world are a bigger-than-expected threat to health and the environment costing at least $16 billion a year, a study said on Thursday.
More than 10,000 "alien" species have gained a foothold in Europe, from Asian tiger mosquitoes to North American ragweed, and at least 1,500 are known to be harmful, the European Environment Agency (EEA) said.