Marine current power the rotation of the earth. The sun acts as the primary driving force, causing winds and temperature differences. Because there are only small fluctuations in current speed and stream location with minimal changes in direction, ocean currents may be suitable locations for deploying energy extraction devices such as turbines. Other effects such as regional differences in temperature and salinity and the Coriolis effect due to the rotation of the earth are also major influences. The kinetic energy of marine currents can be converted in much the same way that a wind turbine extracts energy from the wind, using various types
The Winds of Winter the "Game of Thrones" season four premiere, Martin posted a chapter on his website, titled "Mercy". Martin said the new chapter is actually an old one, though never published nor publicly read. In April 2015, Martin posted a Sansa Stark viewpoint chapter from "The Winds of Winter" titled "Alayne". In May 2016, Martin replaced this chapter with an Arianne Martell chapter he had read from at Mysticon, and an Aeron Greyjoy chapter that was removed from "A Dance with Dragons" was read at Balticon. As of June 2016, a total of 11 chapters from "The Winds of Winter" have been