No-one's denying the fact that Earth's climate has changed in the past, so have the relative positions of entire continents, as any of us who've studied paeleoclimates will readily testify. But those changes occurred over periods of millions/billions of years and not over mere decades or centuries...Milankovitch cycles operate over periods spanning hundreds-of-millennia.
According to the Climate Corbynista, we're are already cooling; to those who're not quite that extreme, we will start cooling soon...Since at least as far back as 2002, cooling has been progged to commence in 'about three-years' time...So far - nothing!
Plate tectonics will not be coming to the rescue, any time soon, either I'm afraid. And neither will as-yet undiscovered undersea volcanoes. So the search for the 'missing' cause (of current warming) is becoming evermore desperate with time, IMO?