With their imagination, I expect. There are no trees growing on the Antarctic Continent (unless they have a laboratory down there that has the soil temperature, and humitidty to grow them artificially)
Oh, and if you're thinking about the North Pole, it's just as bad. The North Pole has nothing up there except sea ice with water under it. No trees once again.
However, there is a major base at the South Pole nowadays. Saw a documentary on it only a few weeks back. Quite luxurious, by the look of it. Also there are lots of creative people there, too, I expect. So I'm pretty sure they will improvise - if they haven't already bought a shop one and flown it down.