There was a book years ago called "The Gentle art of Monkeywrenching" which was mainly about ways to stop and hinder illegal logging, such as removing surveying posts for logging roads and driving large nails into trees where they would be sawn, or taking out some of the oil of machines and replacing with water, leaving oil on top to dip. Hmmm.
This is so true, it is difficult to tell exactly which trees are native in Britain, people have been importing them so long. The Romans probably brought poplars two thousand years ago for example, probably partly because they are so useful to bees. On a rough estimate about 35 of the 350 trees which grow naturally here are native, conifers it is only Yew, Juniper and Scots pine.However non-native species can still have wildlife value and serve ecological roles.