The workshop brought together key representatives from countries active in research and development of algae-based bioenergy, including sustainably produced aquatic biomass (micro- and macro-algae, seaweeds), as well as land-based (terrestial) production of bioenergy from algae. Delegates presented and discussed the current status and future options of algae use, introduced technology prospects and environmental and development issues. From that, open questions were identified, and perspectives for further work considered.