Earlier quoted context omitted.
Worms existed everywhere before glaciation. That they've been returned isn't as big of a deal as the alarmist media wants to make it seem.
It actually can be a pretty huge deal. On their own it's not the biggest issue, but they can compound a lot of invasive plants. Most native flora evolved without earthworms. Earthworms are incredibly effective at breaking down matter into easily accessible nutrients for plants. Native plants aren't built to take advantage of this. You know which plants are though? Non-native invasive plants from the rest of the earth…
I think this is a problem as old as the world. I was recently reading archives of the Jurassic News from roughly 165 million years ago, and I found a very interesting discussion between dinosaurs of that age. They were discussing how these new flying species, commonly referred to as birds, are a problem because they fly, move at vast distances and spread non-native plants by eating seeds and crapping them miles away.