Mountain ranges, rivers, volcanoes and deserts are now named after the civilization that discovered them. World generation is also changed: new terrain features, geothermal fissures and volcanoes, spawn along mountain ridges separating continents, and floodplains now spawn in larger clusters exclusively along rivers. The Future Era returns by adding new Technologies and Civics that will be unlocked randomly. Players are also able to research green power alternatives such as solar, wind and geothermal power stations. However, doing so will increase CO 2 levels in the atmosphere, increasing the frequency of disasters. Late-game buildings can have their effectiveness improved by providing with the new power resource, which can be obtained by burning resources such as coal and oil. The frequency of these events is affected by a new climate system. Additionally, some of these events can be beneficial to players for example, after river floods and volcanic eruptions, affected tiles may have their yields increased. Players are given ways to mitigate these by building improvements such as dams or sea barriers. The expansion introduces natural disasters in the form of volcanic eruptions, river floods, rising sea levels, hurricanes, dust storms, blizzards, tornadoes, and droughts. The player has to face how their environment changes over time, whether randomly or as a consequence of their environmental decisions. The focus of the Gathering Storm expansion is improving the game world with the weather and how human action affects it in the last eras of the game.