Peer-Reviewed Article
Global climate
(2006)
Because of high efficiency, low environmental impacts and a potential role in transforming our energy system into a hydrogen economy, fuel cells are often considered as a key technology for a sustainable energy supply. However, the future framing conditions under which stationary fuel cells have to prove their technical and economic competitiveness are most likely characterised by a reduced demand for space heating, and a growing contribution of renewable energy sources to heat and electricity supply, which both directly limit the potential for combined heat and power generation, and thus also for fuelcells. Taking Germany as a case study, this paper explores the market potential of stationaryfuelcells under the structural changes of the energy demand and supply system required to achieve asustainable energy supply. Results indicate that among the scenarios analysed it is in particular a strategy oriented towards ambitious CO2-reduction targets, which due to its changes in the supply structure is in a position to mobilise a market potential that might be large enough for a successful fuel cell commercialisation. However, under the conditions of a business-as-usual trajectory the sales targets of fuel cell manufacturers cannot be met.
Grave concerns with the Clean Development Mechanism (CDM) have increasingly surfaced in the international climate policy arena. The sectoral approaches described in this paper may be a way to address some of the shortcomings of this Kyoto mechanism. The paper outlines the criticisms that have been raised against the CDM as well as the conflicting interpretations of a sectoral approach and examines in how far it might resolve the mechanism’s perceived shortcomings. Furthermore, it outlines issues that need to be resolved when implementing a sectoral approach: distributing costs and benefits, defining the sector and its baseline, ensuring additionality and tackling procedural issues. A sectoral approach can enable countries to guide their structural development but it also opens up a gap between public and private investment that needs to be addressed before conflicts arise. Sectoral CDM activities may be able to lower transaction costs for projects that otherwise cannot compete in the CDM market and might even pave the way to sectoral greenhouse gas limitation targets in developing countries by establishing the necessary infrastructure for data collection. However, a sectoral CDM cannot be mistaken for a panacea. Some of the mechanism's problems remain, which highlights the need to establish additional instruments to support Southern countries in furthering sustainable development and embarking on a low-emission trajectory.
Die Nanotechnologie verspricht eine Fülle positiver Auswirkungen auf die Gesellschaft. Gleichzeitig werden diverse potentielle Risiken diskutiert. Es ergeben sich eine Vielzahl an ethischen Fragestellungen. Zunächst wird beschrieben, was unter Nanotechnologie zu verstehen ist. Es wird dann das Problemfeld ethischer Fragestellungen skizziert. Im Anschluss wird dargestellt, wie Chancen und Risiken der Nanotechnologie in einem Praxisprojekt adressiert werden können.
In a German case study, environmental input-output analyses (eIOA) combined with NAMEA-type tables were conducted for eleven selected environmental pressure variables. (NAMEA is an acronym for national accounts matrix including environmental accounts.) The analyses were conducted to derive the production-cycle-wide resource use and environmental impact potentials of final-demand product groups. The methodology permits identification and preliminary ranking of 10 product chains along which about two-thirds of German production-born environmental pressures arise. The most relevant product groups are construction work, food, motor vehicles, basic metals, and electricity. The ten product groups are characterized by both high resource requirements and high residual outputs (air emissions, wastes). The EU policy areas of integrated product policy and sustainable use of natural resources may address these product chains as a priority in order to identify and explore the possibility of reducing the environmental impacts from products throughout their life cycles and to decouple environmental impacts from resource use.