I want to know the answer to the following question:
What century started the increase of species invasions?
All the background I'm provided with is that "Overall gamma diversity may be lowered because species are going extinct because of other causes, but even some of the most insidious invaders (e.g.: Dutch elm disease, emerald ash borer, chestnut blight in North America) have not caused their host species to become extinct.". Is that enough to answer the question?
Answer: no