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Several different classes of feedstock can be used in the production of biodiesel, each with its advantages and disadvantages. These feedstocks can be broadly categorized into two main categories: vegetable oils and animal fats.

Different classes 

to produce clean energy 

Vegetable oils, such as soybean oil, canola oil, and palm oil, are widely used in biodiesel production due to their high oil content and low cost. These oils are typically derived from crops grown specifically for biodiesel production, and they offer a number of advantages, such as a stable supply and consistent quality.

Animal fats, such as tallow and yellow grease, are another common feedstock used in biodiesel production. 

These fats are typically a byproduct of the meat industry, and they offer the advantage of being widely available and relatively low-cost. However, they also have some disadvantages, such as the potential for inconsistent quality and the potential to contain impurities that can affect the quality of the final biodiesel product.

In addition to vegetable oils and animal fats, there are several other feedstocks that can be used in the production of biodiesel, including algae and agricultural waste. Algae are a promising feedstock for biodiesel production, as they can produce large amounts of oil per acre and do not compete with food crops. Agricultural waste, such as waste vegetable oil, is another potential feedstock, as it is widely available and relatively low-cost while reducing waste.

The choice of feedstock is important because it directly impacts the quality and sustainability of the final biodiesel product. Some feedstocks, such as soybean oil or canola oil, are more commonly used due to their high oil content and low price, while others, like used cooking oil, offer advantages in terms of sustainability and cost.

Using sustainable feedstocks is critical for the long-term viability of the biodiesel industry. Feedstocks grown on land cleared from forests or competing with food crops can lead to environmental degradation, decreased biodiversity, and increased food prices. Using sustainable feedstocks, such as those produced from agricultural waste or algae, reduces the environmental impact of biodiesel production and helps ensure the industry's long-term viability.

Furthermore, sustainable feedstocks can also help improve the economic viability of biodiesel production. The cost of feedstocks is a major factor in the overall cost of biodiesel. Sustainable feedstocks can help reduce this cost by using lower-cost feedstocks and avoiding the costs associated with sourcing feedstocks from more remote or environmentally sensitive areas.

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