Energy return on investmentIn energy economics and ecological energetics, energy return on investment (EROI), also sometimes called energy returned on energy invested (ERoEI), is the ratio of the amount of usable energy (the exergy) delivered from a particular energy resource to the amount of exergy used to obtain that energy resource. Arithmetically the EROI can be defined as: When the EROI of a source of energy is less than or equal to one, that energy source becomes a net "energy sink", and can no longer be used as a source of energy.
Emissions tradingEmissions trading is a market-based approach to controlling pollution by providing economic incentives for reducing the emissions of pollutants. The concept is also known as cap and trade (CAT) or emissions trading scheme (ETS). Carbon emission trading for and other greenhouse gases has been introduced in China, the European Union and other countries as a key tool for climate change mitigation. Other schemes include sulfur dioxide and other pollutants.
Natural gas vehicleA Natural Gas Vehicle (NGV) is an alternative fuel vehicle that uses compressed natural gas (CNG) or liquefied natural gas (LNG). Natural gas vehicles should not be confused with autogas vehicles powered by liquefied petroleum gas (LPG), mainly propane, a fuel with a fundamentally different composition. In a natural-gas-powered vehicle, energy is released by the combustion of methane gas (MethaneCH4) fuel with oxygen (OxygenO2) from the air to form carbon dioxide (Carbon dioxideCO2) and water vapor (WaterH2O) in an internal combustion engine.
BrazilBrazil (Brasil; bɾaˈziw), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in South America and in Latin America. Brazil is the world's fifth-largest country by area and the seventh most populous. Its capital is Brasília, and its most populous city is São Paulo. The federation is composed of the union of the 26 states and the Federal District. It is the only country in the Americas to have Portuguese as an official language.
Brazilian literatureBrazilian literature is the literature written in the Portuguese language by Brazilians or in Brazil, including works written prior to the country's independence in 1822. Throughout its early years, literature from Brazil followed the literary trends of Portugal, gradually shifting to a different and authentic writing style in the course of the 19th and 20th centuries, in the search for truly Brazilian themes and use of Brazilian forms. Portuguese is a Romance language and the sole official language of Brazil.
Energy qualityEnergy quality is a measure of the ease with which a form of energy can be converted to useful work or to another form of energy: i.e. its content of thermodynamic free energy. A high quality form of energy has a high content of thermodynamic free energy, and therefore a high proportion of it can be converted to work; whereas with low quality forms of energy, only a small proportion can be converted to work, and the remainder is dissipated as heat.
Petroleum geologyPetroleum geology is the study of origin, occurrence, movement, accumulation, and exploration of hydrocarbon fuels. It refers to the specific set of geological disciplines that are applied to the search for hydrocarbons (oil exploration). Petroleum geology is principally concerned with the evaluation of seven key elements in sedimentary basins: Source Reservoir Seal Trap Timing Maturation Migration In general, all these elements must be assessed via a limited 'window' into the subsurface world, provided by one (or possibly more) exploration wells.
Environmental impact of the petroleum industryThe environmental impact of the petroleum industry is extensive and expansive due to petroleum having many uses. Crude oil and natural gas are primary energy and raw material sources that enable numerous aspects of modern daily life and the world economy. Their supply has grown quickly over the last 150 years to meet the demands of the rapidly increasing human population, creativity, knowledge, and consumerism. Substantial quantities of toxic and non-toxic waste are generated during the extraction, refinement, and transportation stages of oil and gas.
BraziliansBrazilians (Brasileiros, bɾaziˈlejɾus) are the citizens of Brazil. A Brazilian can also be a person born abroad to a Brazilian parent or legal guardian as well as a person who acquired Brazilian citizenship. Brazil is a multiethnic society, which means that it is home to people of many ethnic origins, and there is no correlation between one's stock and their Brazilian identity. Being Brazilian is a civic phenomenon, rather than an ethnic one.
Brazilian ArmyThe Brazilian Army (Exército Brasileiro) is the land arm of the Brazilian Armed Forces. The Brazilian Army has fought in several international conflicts, mostly in South America during the 19th century. In the 20th century, it fought on the Allied side in World War I and World War II. Aligned with the Western Bloc during the military dictatorship in Brazil from 1964 to 1985, it also had active participation in Latin America and Southern Portuguese Africa during the Cold War, as well as taking part in UN peacekeeping missions worldwide since the late 1950s.
