There have already been a couple of live-action Swamp Thing movies, but although they're campy fun, they are most definitely not a good representation of the the layered, interesting DC character. There's been talk of Swamp Thing appearing in Guillermo del Toro's Dark Universe movie (don't hold your breath for that one), but short of that or another current DCCU outing it seems the best chance we had for decent take on the Earth Elemental came and went with the aborted 2010 project, which would have been produced by Joel Silver and written by Vincenzo Natali.
The latter has now posted the first four pages of his screenplay, and the direction the movie was going should be obvious to fans of Alan Moore's acclaimed run.
That's pretty much exactly how Moore begins his Saga of The Swamp Thing, so if the movie had of continued taking influence from that, we could have had a damn masterpiece on our hands. Hopefully if anyone else ever takes a crack at this they'll fully understand and appreciate the potential of the character, and not simply attempt to make a superhero monster movie.