Write any two disadvantages of biomass energy.

The two disadvantages of biomass are : 

1. Huge amount of energy can not be obtained at once. 
2. It causes air pollution by release of smoke. 

Burning biomass also releases carbon monoxide, leading to headaches, nausea, dizziness, and in high concentrations, premature death. What's more, burning biomass for electricity also produces nitrogen oxides (like nitrogen dioxide) and nasty cancer-causing chemicals, including benzene and formaldehyde.Most carbon emissions linked to human activity are in the form of carbon dioxide gas (CO₂). ... They essentially allow biomass burning to cause much more global warming per unit weight than other human-associated carbon sources.

Solid biomass combustion can emit various air pollutants that negatively affect human health, and air pollution from biomass combustion in the residential sector has recently come under the spotlight. ... Incomplete combustion also emits carbon monoxide (CO).When biomass is burned, this stored energy is released as heat. Burning biomass releases carbon dioxide. However, plants also take carbon dioxide out of the atmosphere and use it to grow their leaves, flowers, branches, and stems. That same carbon dioxide is returned to the air when the plants are burned.