I don’t think he would last long with our current oxygen levels, there is a reason why such giant creatures don’t exist anymore.

On top of that like comments said if we just waited out he would starve to dead, even if we were not provided food.

*Edit

Well looks like I was wrong, thx for clarifying that out.

Really though the reason for big animals not being as prevelant anymore was really the oxygen levels Idk where I got that from.

But then it is really weird how the evolution meta didn’t evolve back to the huge beasts we see on books, someone said in the comments that it was due to the mammals success, if so it puts things really into perspective.