(a) Energy Return on Energy Invested (EROI) values from previously published LCA studies of algal biofuel production. (b) EROI values resulting from the “ worst ” (Low Productivity + Dry Extraction + anaerobic digestion) and “ best ” (High Productivity + Wet Extraction + anaerobic digestion) cases of this study. Center lines represent median values, edges of boxes represent 25th and 75th percentiles, and error bars represent 5th and 95th percentiles of the distributions resulting from 10 000 Monte Carlo simulations.