Microalgae are swift replicating photosynthetic microorganisms with several applications for food, chemicals, medicine and fuel. Microalgae have been identified to be suitable for biofuels production, due to their high lipid contents. Microalgae-based biofuels have the potential to meet the increasing energy demands and reduce greenhouse gas (GHG) emissions. However, the present state of technology does not economically support sustainable large-scale production. The biofuel production process comprises the upstream and downstream processing phases, with several uncertainties involved. This review examines the various production and processing stages, and considers the use of chemometric methods in identifying and understanding relationships from measured study parameters via statistical methods, across microalgae production stages. This approach enables collection of relevant information for system performance assessment. The principal benefit of such analysis is the identification of the key contributing factors, useful for decision makers to improve system design, operation and process economics. Chemometrics proffers options for time saving in data analysis, as well as efficient process optimization, which could be relevant for the continuous growth of the microalgae industry.

Microalgae have a great potential for the sustainable production of food and fuel for a growing world population with increasing demands and changing habits. Since they are cultivated in technical systems, they do not contribute to land use competition, loss of biodiversity, and environmental pollution like other food and energy crops. Despite these advantages, the commercialization of algae technology is still in an infant stage. Algae fuel production has so far failed due to low oil prices and lack of economic viability. However, integrated food and fuel production is considered promising because the food market is more diversified and open to new and innovative products than the energy market. Integrated food and fuel production from microalgae can not only achieve higher returns on investment but also greater acceptance than fuel production alone. From the sociotechnical point of view, it is however crucial that the integrated algae production system will fulfill the promises of health and sustainability. To achieve this, a codesign approach is used, considering public perception and the views, knowledge and values of citizens and stakeholders already at an early stage in the research and innovation process.

Despite the technical feasibility of renewable energy technologies and their contribution to climate-friendly power production public opposition can be a hurdle for new installations of renewable energy plants. This study assesses citizens’ perceptions of the Agrophotovoltaics (APV) technology by applying the Responsible Research and Innovation (RRI) concept. APV combines biomass cultivation and solar power production at the same site in order to reduce land use conflict of food vs. energy production. In a workshop, citizens’ perception on APV before building the first pilot plant was investigated to analyze relevant aspects for the innovation process and its framework at an early stage of the technology development process. This paper describes the findings from this workshop focusing on the impact of APV on landscape, biodiversity, economy, and on the requirements for regulatory framework.

In response to climate change, the limited availability of fossil fuels and the risks associated with nuclear energy, Germany’s energy transition aims to achieve a sustainable, environmentally sound supply of energy services. A monitoring process was established by the Federal Government to ensure that the targets defined for the transformation will be reached. The indicator system developed for that purpose mainly focuses on “classical” environmental, economic and technological indicators for which statistical time series data and political targets are available. Important socio-technical aspects of the energy system and its transition, such as affordability, participation and acceptance, remain largely neglected. This paper aims to contribute to the discussion on indicators needed for political decision-making to appropriately address sustainability aspects of the energy system and its transition, as well as to contribute to improving existing indicator systems. Therefore, the sustainability rules of the Integrative Concept of Sustainable Development were translated into indicators based on an in-depth literature review. The resulting abundance of possible indicators was then reduced using selection criteria such as comprehensiveness, possibility to determine targets and availability of data. Finally, the indicator system was adjusted based on feedback of experts from different disciplines and stakeholder interviews in the particular investigation area of southwest Thuringia. Besides classical indicators related to techno-economic and environmental aspects, the finally developed indicator system includes new sustainability indicators related to the socio-technical interface of the energy system. Thus, it is considered suitable for assessing the sustainability of the Germany energy system and its transition in an integrative and comprehensive way. The indicator system is helpful to systematically identify strengths and weaknesses of the energy system and interdependencies and conflicts of goals between different sustainability aspects. All in all, we believe that applying the indicator system appropriately can support the development of resilient political strategies for a successful energy transition.

Scientific studies have shown that mixed forests of silver fir (Abies alba Mill.) and European beech (Fagus sylvatica L.) provide higher ecosystem services than monospecific forests. Mixed forests are known for their high resilience to climate change impacts and superior biodiversity compared to monospecific forests. Despite this superiority, the transformation from monospecific to mixed forests can meet socio-technical challenges that are manifested in dissent or even in conflicts. The integration of stakeholders and citizens plays a key role in analyzing their perceptions and views of forest transformation. Their knowledge is required to co-design and implement socially acceptable options and pathways to increase the share of mixed forests. Based on a survey in Southwest Germany, we analyzed stakeholders’ and citizens’ perceptions of ecosystem services of monospecific and mixed forests of silver fir and beech. The findings show that people believe that mixed forests provide better cultural, regulating, and supporting ecosystem services than monospecific forests. However, provisioning services were perceived as being equally or even better provided by monospecific forests. The assumed abundance of old trees and the feelings of pleasantness especially influenced the superior perception of ecosystem services provided by mixed forests. The results indicate that there is public support for the transformation of monospecific silver fir and beech forests into mixed forests in Southwest Germany.