Avatar (2009 film) the film's success, Cameron signed with 20th Century Fox to produce four sequels: "Avatar 2" and "Avatar 3" are currently filming, and will be released on December 18, 2020, and December 17, 2021 respectively; subsequent sequels will start shooting as soon as they wrap filming, and will be released in 2024 and 2025. Several cast members are expected to return, including Worthington, Saldana, Lang, and Weaver. In 2154, humans have depleted Earth's natural resources, leading to a severe energy crisis. The Resources Development Administration (RDA for short) mines for a valuable mineral — unobtanium — on Pandora, a densely forested
Fictional currency by Frederik Pohl. Other plot factors can affect the worth of currency: for instance, in "The Moon Metal" by Garrett P. Serviss the world's currency standard must be switched from gold to a mysterious new chemical, "artemisium", after the discovery of vast mineral deposits in the Antarctic devalues all known precious metals. While modern fiat currencies lack intrinsic worth, some fictional currencies are designed to be valuable in their own right. Intrinsically valuable currencies are used in the Frank Herbert's "Dune" universe; the Dragonlance world of Krynn where steel coins are the primary currency and are more valuable than gold