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You are completely leaving out the impact of farming, and all the large animals in Europe have been wiped out already, so your baseline is already way off. If you are willing to completely change the way we live, grow food and protect the environment, then perhaps we could make a change.
In the US, we've killed off all the natural predators for deer, so we have to keep them in check through hunting. Bringing the system back in balance would mean reintroducing wolves throughout much of the country.
Well, the boar survives very well on the continent, even if its gone from the UK. I don't know how many other large animals you are thinking of though. There are Wolves in the alps, and bears in the Balkans I believe still. Deer in the UK are so numerous they are posing a problem to some trees now.
So really all big animals that I can think of are still there in Europe. What did you have in mind?
As for farming, there is so much land set aside these days because Europe over produces that I don't see how it is more of a threat than it was. Plus production is far more efficient these days, we are getting more and more from a square meter of land.