The energy industry is the totality of all of the industries involved in the production and sale of energy, including fuel extraction, manufacturing, refining and distribution. Modern society consumes large amounts of fuel, and the energy industry is a crucial part of the infrastructure and maintenance of society in almost all countries. The increased dependence during the 20th century on carbon-emitting sources of energy such as fossil fuels, and carbon-emitting renewables such as biomass, means that the energy industry has frequently been an important contributor to pollution and environmental impacts of the economy. Until recently, fossil fuels were the main source of energy generation in most parts of the world, and are a major contributor to global warming and pollution. As part of human adaptation to global warming, many economies are investing in renewable and sustainable energy.

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