Original sentence: Biodiesel is an alternative to petroleum-based diesel fuel and is made from renewable resources such as vegetable oils or animal fats.Biodiesel use and production is increasing rapidly, especially in Europe, the United States, and Asia, though in all markets, it still makes up a small proportion of fuel sold.Currently, biodiesel is more expensive to produce than petroleum diesel, which is often stated as the primary factor keeping it from being in more widespread usage.It is also more likely to gel, making it unable to flow, which limits its use in pure form in cold climates
Edited sentence: Biodiesel is an alternative to petroleum-based diesel fuel and is made from renewable resources such as vegetable oils, animal fats, or algae.Currently, biodiesel is more expensive to produce than petroleum diesel, which appears to be the primary factor keeping it from being in more widespread usage