Wood remains the largest biomass source; examples include
forest residues (such as dead trees, branches and tree stumps),
yard clippings, wood chips and even municipal solid waste.
Other sources of biomass includs plant or animal matter that
can be converted into fibers or other chemicals, including biofuels and biochar.
Industrial biomass is often grown from numerous types of plants,
including miscanthus, switchgrass, hemp, corn, poplar, willow,
sorghum, sugarcane, bamboo, and a variety of tree species,
ranging from eucalyptus to oil palm (palm oil).
There is research involving algae or algae-derived biomass, as
this non-food resource can be produced at rates five to ten
times those of other types of land-based agriculture, such
as corn and soy.
Virgin biomass includes all naturally occurring terrestrial plants such as trees, bushes and grass.
is produced as a low value byproduct of various industrial sectors such
as agriculture (corn stover, sugarcane bagasse, straw etc.)
and forestry (saw mill and paper mill discards).
Ephemeral biomass is plant matter that decays quickly (such as leaves, grasses, ...)
and returns CO2 to the air much quicker.
The burning and natural decomposition of biomass including agricultural waste
adds large amounts of CO2 to the atmosphere.