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Caption: Locations of volcanic belts (red triangles) and hydrocarbons occurrences (white circles correspond to oil fields and yellow pentagons correspond to gas fields) have been combined with distribution of megacities (green stars). The ring of fire is presented as the yellow hatched polygon. Statistics of participation of energy production technologies are shown in the lower panel (left pies), as well as costs of energy production of one kWh (right pies) for Bogotá, Los Angeles, and Jakarta cities (purple squares on the map). Coordinate system in WGS-84.
