# 2. Biomass production

Biomass is material from plants or animals that is not used for food or feed; it includes also waste from farming or horticulture (yard waste), food processing, animal farming (manure rich in nitrogen and phosphorus), human waste from sewage plants and municipal waste. For land plants but also microalgae and macroalgae (seaweed) photosynthesis is the driving factor for growth.

For a proper understanding of this chapter it is important to refresh the basic knowledge of photosynthesis. To help you the following video about photosynthesis is embedded.

Explanation of photosynthesis https://www.youtube.com/embed/g78utcLQrJ4