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Greater Angostura
Greater Angostura is an offshore conventional oil and gas field in shallow water off the northeast coast of Trinidad, producing since first oil in 2005.
Greater Cleveland Regional Transit Authority
The Greater Cleveland Regional Transit Authority (GCRTA), also called Cleveland RTA, is the public transit agency serving Cleveland, Ohio, and Cuyahoga County, operating bus, rapid transit, and paratransit service since 1975.
Greater Nile Oil Pipeline
The Greater Nile Oil Pipeline is a 1,610 km crude oil pipeline in Sudan running from the Heglig oil fields to the Bashayer terminal on the Red Sea.
Greater Sunrise
Greater Sunrise is an undeveloped gas and condensate field in the Timor Sea, discovered by Woodside in 1974, held undeveloped for decades by maritime boundary disputes between Australia and Timor-Leste.
Greater Tortue Ahmeyim FLNG Terminal
The Greater Tortue Ahmeyim FLNG Terminal is a floating liquefied natural gas facility moored offshore on the maritime border between Mauritania and Senegal, which made both countries LNG exporters in 2025.
Greave
A greave, also called a shin guard or sune-ate, is armor that protects the lower leg and shin, used from ancient Greek and Roman bronze guards to medieval steel plate.
Gree Electric (珠海格力电器股份有限公司)
Gree Electric, also known as Gree Electric Appliances, is a Chinese home appliance maker founded in Zhuhai in 1991, one of the world's largest air conditioner makers.
Greedy algorithm
A greedy algorithm is an optimization method that builds a solution step by step, taking the choice of greatest immediate benefit and never reconsidering, optimal for some problems.
Greedy coordinate gradient attack
The greedy coordinate gradient (GCG) attack is an automated jailbreak method for aligned large language models, introduced in a July 2023 paper by Andy Zou and colleagues.
Greek fire
Greek fire, also known as Byzantine fire, was a closely guarded Byzantine incendiary weapon, projected from ship siphons, that kept burning on water and saved Constantinople from Arab sieges.
Greek Revival architecture
Greek Revival architecture, also known as the Greek Revival style or Doric Revival, is an architectural style modeled on ancient Greek temples, dominant in the United States from about 1820 to 1860.
Green building
Green building, also known as sustainable building or green construction, is the practice of creating structures that are environmentally responsible and resource-efficient throughout a building's life cycle.
Green Button
Green Button is an industry-led data standard, launched in 2012, that gives utility customers secure access to their own electricity, natural gas, and water usage data.
Green computing
Green computing, also known as Green IT or ICT sustainability, is the effort to reduce computing's environmental impact, spanning data center energy use, manufacturing emissions, water, and e-waste.
Green density
Green density is the density of a powder compact after forming but before sintering; in ceramics it typically reaches 50–60% of theoretical, and higher values shorten sintering.
Green Dome (القبة الخضراء)
The Green Dome (القبة الخضراء) is the green dome over the graves of Muhammad, Abu Bakr, and Umar at the Prophet's Mosque in Medina, built in 1279.
Green Dragon (loitering munition)
The Green Dragon is a tactical loitering munition developed by Israel Aerospace Industries for small ground units and special operations forces, with up to two hours of loitering time.
Green electricity certificate (China)
A green electricity certificate (GEC, 绿证) is China's official electronic certificate for renewable electricity, one per 1,000 kWh, piloted in 2017 and extended to all renewable projects in 2023.
Green Energy Open Access (India)
Green Energy Open Access is an Indian regulatory framework, created by 2022 rules, letting consumers buy renewable power directly from generators instead of distribution licensees.
Green Factory (certification)
Green Factory (绿色工厂) certification is a voluntary Chinese government designation for manufacturing plants meeting standards for low energy use and clean production, run by MIIT since 2016.
Green Flexibility
Green Flexibility is a German developer, owner, and operator of grid-scale battery storage systems, founded in Bavaria in 2023 by former executives of the home-storage company sonnen.
Green GaN laser diode
A green GaN laser diode is an edge-emitting semiconductor laser that emits green light directly at roughly 515 to 535 nm, an alternative to frequency-doubled infrared lasers.
Green Genius
Green Genius, formerly Modus Energy International B.V., is a Lithuanian renewable energy developer and independent power producer that develops solar, wind, biomethane, and battery storage assets across Lithuania, Latvia, Poland, and Italy.
Green Grid
The Green Grid is an industry consortium focused on data center energy efficiency, formed in 2007 and known for creating the Power Usage Effectiveness (PUE) metric.
Green hydrogen
Green hydrogen is hydrogen made by splitting water with renewable electricity from solar or wind, producing no CO2 and supplying less than 1% of global hydrogen.
Green Hydrogen Systems
Green Hydrogen Systems A/S was a Danish manufacturer of modular pressurised alkaline electrolysers for green hydrogen from renewable electricity, founded in Kolding, Denmark, in 2007 and bankrupt by 2025.
Green infrastructure (stormwater)
Green infrastructure for stormwater management uses plant and soil systems, permeable surfaces, and landscaping to store, infiltrate, or evapotranspirate stormwater, reducing flows to sewer systems and surface waters.
Green Innovation Fund
The Green Innovation Fund (グリーンイノベーション基金事業) is a Japanese research funding program run by NEDO supporting decarbonization projects for up to 10 years, including hydrogen-based steelmaking.
Green laser powder bed fusion of copper
Green laser powder bed fusion of copper is 3D printing of copper with green lasers, typically at 515 or 532 nm, which copper absorbs far more efficiently than infrared.
Green Line (MBTA)
The Green Line is a light rail line of the MBTA in Boston, running four branches over about 23 miles and descended from America's first subway, opened in 1897.