The cons of biomass include: 1. Limited availability: Biomass resources, such as wood and crop residues, are not available in unlimited quantities. This means that their use as a source of energy can be limited by the availability and sustainability of these resources. 2. Environmental impact: While biomass is often considered a renewable energy source, its combustion can release carbon dioxide (CO2) and other pollutants into the atmosphere. This contributes to air pollution and can have negative effects on human health and the environment. 3. Land and water use: Biomass production requires large amounts of land and water resources. This can lead to competition with other land uses, such as agriculture, and put pressure on water supplies, especially in regions with limited water resources. 4. Transport and storage costs: Biomass often needs to be transported from the source to the energy facility, which can incur transportation costs and result in emissions from the vehicles used. Additionally, biomass needs to be properly stored to prevent degradation and ensure its quality, which can add to the overall cost. 5. Efficiency and technology limitations: The conversion of biomass into energy is not as efficient as other energy sources. The technology used for biomass conversion, such as combustion or gasification, may still be relatively expensive and less mature compared to other renewable energy technologies. 6. Impact on biodiversity: Large-scale biomass production can have negative effects on biodiversity, as it may require the conversion of natural habitats or the use of genetically modified crops. This can disrupt ecosystems and threaten native species. 7. Competition with food production: Biomass production, particularly biofuels made from crops like corn or sugarcane, can compete with food production. This can lead to higher food prices and food security concerns, especially in regions where food availability is already a challenge. It's important to note that while biomass has its drawbacks, it also has benefits such as being a renewable energy source and contributing to waste reduction. However, careful planning and sustainable practices are necessary to mitigate the negative impacts associated with its use.