Marine energy
[4] The oceans represent a vast and largely untapped source of energy in the form of surface waves, fluid flow, salinity gradients, and thermal differences.This energy source is not easy to understand, as it is not directly occurring in nature in the form of heat, waterfalls, wind, waves, or radiation.Wave energy potential is greatest between 30° and 60° latitude in both hemispheres on the west coast because of the global direction of wind.When evaluating wave energy as a technology type, it is important to distinguish between the four most common approaches: point absorber buoys, surface attenuators, oscillating water columns, and overtopping devices.[8] The wave energy sector is reaching a significant milestone in the development of the industry, with positive steps towards commercial viability being taken.[9] The backing of major utility companies is now manifesting itself through partnerships within the development process, unlocking further investment and, in some cases, international co-operation.