Table 3.

Thematic clusters in literature.

Cluster	Theme	Keywords
1	Circular Economy	Application; biomass; circular economy; food industry; product; process; protein; source; valorization; value
2	Green Economy	Agriculture; climate change; development; economy; green economy; implementation; sustainable development; policy; practice; sector; transition; water
3	Food Waste	Anaerobic digestion; food waste; nutrient; plant; recovery; recycling; reuse; soil; treatment; waste
4	Environmental Impacts	Environmental impact; life cycle assessment