A report released by the Standford University's Global Climate and Energy Project indicated that net negative emissions can be achieved in biofuel plants and biorefineries if the carbon dioxide released during the bioenergy conversion process is captured and stored. The report identifies 16 bioenergy projects around the world that implement carbon capture and storage (CCS) by means of geological storage or through beneficial reuse. One project in a US-based ethanol plant uses a carbon reduction program that captures about 1000 metric tons of carbon dioxide per day from the biofuel fermentation process and sequesters it in a sandstone formation below ground. The report cites the high cost of CCS as one of the challenges faced by the project.