In addition to being eco-friendly, the products may be more effective than existing chemical products. The most attractive approach involves integration of all components in a global business model. In the integrated marine biorefinery, biofuel is one product but more valuable feed, food and other materials are also produced (Figure 2.3), and indeed may have to be produced to make the refinery financially viable. As in petrochemical refineries, profit margins on bulk production fuels are likely to be low, and higher revenues from high-value, low-volume materials make biorefining more attractive. Microalgal biomass cultivated for its lipid content for conversion to biodiesel offers several possibilities for obtaining additional commercial materials such as fermentation to obtain ethanol (low conversion rates) and biogas.