Alien species on the rise worldwide

Source: ScienceDaily

Although it was known that the number of alien species increased during the last decades, it remained unclear whether or not the accumulation of alien species has already reached a point of slow-down. A new study on the topic has an answer now: for all groups of organisms on all continents, the number of alien species has increased continuously during the last 200 years.

https://www.sciencedaily.com/releases/2017/02/170215084444.htm