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Any plant or animal material that can be burned is a biofuel so heir is no limit to the number.

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Why are biofuels considered renewable sources of energy?

Biofuels are considered renewable sources of energy because they are derived from organic materials like plants and algae, which can be grown and harvested repeatedly. This means that as long as these organic materials are replanted and grown, biofuels can be continuously produced, making them a sustainable and renewable energy source.


What types of fuel can be produced from algae?

Algae can be used to produce biofuels such as biodiesel, bioethanol, and biogas. These biofuels are considered renewable and have the potential to reduce greenhouse gas emissions compared to fossil fuels.


Why biofuels don't cause a net increase in greenhouse gases?

Biofuels are considered to have a neutral impact on greenhouse gas emissions because they are made from renewable biological materials, such as plants, which absorb carbon dioxide during their growth. When biofuels are burned for energy, the CO2 released is roughly equivalent to what the plants absorbed, creating a closed carbon cycle. Additionally, biofuels can reduce reliance on fossil fuels, further decreasing overall greenhouse gas emissions. However, the net impact can vary based on factors like land use changes and cultivation practices.


Why do biofuels not contribute to global warming even though burning biofuels releases carbon dioxide?

Biofuels are part of the natural carbon cycle, in which plants absorb carbon dioxide from the air and this becomes carbon which is eventually returned to the air when vegetation rots or is burnt, or when animals eat it and respire carbon dioxide back into the air. Thus, although burning of wood and biofuels does release carbon dioxide back into the air, this process does not add to the long term concentration of atmospheric carbon dioxide. When we create carbon dioxide from carbon that has been sequestered underground, we add new carbon dioxide to the air, increasing its concentration and causing global warming.


How are biofuels not carbon neutral?

Biofuels are carbon neutral.Bio fuels are considered carbon neutral because they give off the same amount of carbon when burned that they absorb while growing. So, unlike fossil fuels (coal, oil and natural gas), they don't pollute the environment by adding extra CO2 to the atmosphere.