Energie-, Verkehrs- und Klimapolitik
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In the energy sector, few topics, if any, are more hyped than hydrogen. Countries develop hydrogen strategies to provide a perspective for hydrogen production and use in order to meet climate-neutrality goals. However, in this topical field the role of water is less accentuated. Hence, in this study, we seek to map the interrelations between the water and wastewater sector on the one hand and the hydrogen sector on the other hand, before reflecting upon our findings in a country case study. We chose the Hashemite Kingdom of Jordan because (i) hydrogen is politically discussed not least due to its high potentials for solar PV, and (ii) Jordan is water stressed - definitely a bad precondition for water-splitting electrolyzers. This research is based on a project called the German-Jordanian Water-Hydrogen-Dialogue (GJWHD), which started with comprehensive desk research mostly to map the intersectoral relations and to scope the situation in Jordan. Then, we carried out two expert workshops in Wuppertal, Germany, and Amman, Jordan, in order to further discuss the nexus by inviting a diverse set of stakeholders. The mapping exercise shows various options for hydrogen production and opportunities for planning hydrogen projects in water-scarce contexts such as Jordan.
Agriculture is a major sector responsible for greenhouse gas emissions. Local food production can contribute to reducing transport-related emissions. Since most of the worldwide population lives in cities, locally producing food implies practicing agriculture in urban and peri-urban areas. Exemplary, we analyze the potential to produce fresh vegetables within Berlin, Germany. We investigate the spatial extent of five different urban spaces for soil-based agriculture or gardening, i.e., non-built residential areas, allotment gardens, rooftops, supermarket parking lots, and cemeteries. We also quantify inputs required for such food production in terms of water, human resources, and investment. Our findings highlight that up to 82% of Berlin’s vegetable demand could be produced within the city, based on a reasonable validation of existing areas. Meeting this potential requires 42 km2 of urban spaces for cultivation, a considerable amount of irrigation water, around 17 thousand gardeners, and over 750 million EUR of initial investments. The final vegetable cost would be around 2 EUR to 10 EUR per kg without any profit margin. We conclude that it is realistic to produce a significant amount of Berlin's vegetable demand within the city, even if it comes with great challenges.
Sustainable urban mobility : interventions, key measures and solutions, actors, and opportunities
(2023)
Der Gebäudebereich steht nicht nur aufgrund seiner Umweltwirkungen vor großen Herausforderungen. Bei der Einhaltung der Klima- und Nachhaltigkeitsziele spielen auch die mit langen Lebens- und Nutzungsdauern von Gebäuden einhergehenden Investitionszyklen eine entscheidende Rolle. Politische und planerische Maßnahmen werden bislang hauptsächlich im Rahmen von Effizienz- und Konsistenzstrategien entwickelt und umgesetzt, um Umweltwirkungen zu minimieren. Die Suffizienzstrategie erfährt im Vergleich dazu eine deutlich geringere Aufmerksamkeit. Ziel dieses Vorhabens ist es deshalb, Suffizienz für den Gebäudebereich zu definieren, geeignete technische und organisatorische Ansätze zu ihrer Unterstützung zu identifizieren sowie Vorschläge zu ihrer Verankerung in politischen und rechtlichen Rahmenbedingungen und Instrumenten zu erarbeiten und exemplarisch darzustellen.
Exnovation und Verkehrswende : vom Automobilitätsregime zu einer nachhaltigen urbanen Mobilität
(2023)
Der Verkehrssektor ist das Sorgenkind beim Klimaschutz. Um die Klimaschutzziele zu erreichen, sind ein rascher und tiefgreifender Wandel beim Verkehr und insgesamt weniger Autoverkehr nötig. In der Verkehrspolitik werden dazu meist innovationsorientierte Strategien verfolgt. Solange das Auto aber seinen privilegierten Status als bevorzugtes Verkehrsmittel behält, wird eine Verlagerung auf innovative und nachhaltige Alternativen verhindert.
Alina Wetzchewald untersucht hier, ob und wie "Exnovation" - also die Beendigung nichtnachhaltiger Praktiken - eine urbane Verkehrswende befördern kann, sodass sich nachhaltige Innovationen und Alternativen in der Folge besser etablieren können. Die Autorin begründet die Notwendigkeit von Exnovation, erarbeitet theoriebasiert Erklärungsansätze und untersucht Exnovation am Fall der Stadt Oslo. Im Ergebnis kann sie konkrete Empfehlungen zur aktiven Gestaltung der urbanen Verkehrswende durch Exnovation ableiten.
The EU Horizon 2020 project HiEff-BioPower (grant agreement No 727330, duration: 10/2016 - 09/2021) aimed at the development of a new, innovative, fuel flexible and highly efficient biomass CHP technology for a capacity range of 1 to 10 MW total energy output, suitable e.g. for on-site generation at larger residential apartment buildings or local heat grids. The new technology shall define a new milestone in terms of CHP efficiency and contribute to a sustainable energy supply based on renewable energies using otherwise unused residual biomass. It consists of a fuel-flexible updraft gasification technology with ultra-low particulate matter emissions, an integrated gas cleaning system and a solid oxide fuel cell (SOFC). The technology shall be applicable for a wide fuel spectrum for residual biomass (wood pellets, wood chips or selected agricultural fuels like agro-pellets) and achieve high gross electric (40%) and overall (90%) efficiencies as well as almost zero gaseous and particulate matter (PM) emissions (close or below the level of detection) as non-energy benefits. At the end of the project, final technology data has become available, as well as techno-economic analyses and market studies. Based on this data, this paper presents final results from the environmental impact assessment of the new HiEff-BioPower technology.