The role of hydrogen and fuel cells in the global energy system

Hydrogen technologies have experienced cycles of excessive expectations followed by disillusion. Nonetheless, a growing body of evidence suggests these technologies form an attractive option for the deep decarb onisation of global energy systems, and that recent improvements in their cost and performance point towards economic viability as well. This paper is a comprehensive review of the potential role that hydrogen could play in the provision of electricity, h eat, industry, transport and energy storage in a low - carbon energy system, and an assessment of the status of hydrogen in being able to fulfil that potential. The picture that emerges is one of qualified promise: hydrogen is well established in certain nic hes such as forklift trucks, while mainstream applications are now forthcoming. Hydrogen vehicles are available commercially in several countries, and 225,000 fuel cell home heating systems have been sold. This represents a step change from the situation of only five years ago. This review shows that challenges around cost and performance remain, and considerable improvements are still required for hydrogen to become truly competitive. But such competitiveness in the medium - term future no longer seems an unrealistic prospect, which fully justifies the growing interest and policy support for these technologies around the world

Extreme sports in natural areas: Looming disaster or a catalyst for a paradigm shift in land use planning?

Historically, visitors' motives for visiting protected areas included 'rest, relaxation and reinvigoration'. Ecological impacts were typically low. Recent trends have increased use of protected areas for extreme sports, with greater numbers undertaking more active recreation, such as extreme sports. The effect of this trend is considered, together with potential management options. We propose that the development of appropriately targeted and delivered educational programmes could minimise environmental degradation. However, to maximise ecological conservation in protected lands we consider that a major paradigm shift is required. This will require a more strategic, holistic approach to planning and managing outdoor recreation/sport destinations incorporating collaboration across stakeholders. Based on past experience, to continue with the current model will ultimately accelerate biodiversity loss, degradation of protected areas, and loss of recreational amenity