An economy based on trade
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Biomass is a fuel that is produced from all the organic materials made by plants and animals. It is used as an energy source for many domestic purposes. The most common biomass materials used for energy are plants, wood, and waste. Biomass can be burned to create heat, converted into electricity, or processed into biofuel. Biomass can be burned by thermal conversion and used for energy.
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On the medieval world-maps it was represented only the part of the world known as the 'old world', which is consisted of Europe, Asia and Africa. Before the big discoveries, people living in this continents had knowledge only of this part of the world, while South and North America, Australia and Antarctica where still unknown to them, thus they are missing in the world-maps of this period.