I will be looking into the sustainability of an algae value chain using Porphyridium as a feedstock. A biorefinery could produce proteins, sugars en phycoerythrin (PE) from the Porphyridium algae. However, which value chain should I use as a comparison scenario (=a reference case)? In other words, which (fossil) feedstocks can be replaced by the Porphyridium algae and why does it offer an advantage to produce proteins, sugars and PE from the algae?