121 research outputs found

    Environmental Effects of Stratospheric Ozone Depletion, UV Radiation, and interactions with Climate Change: 2022 Assessment Report

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    The Montreal Protocol on Substances that Deplete the Ozone Layer was established 35 years ago following the 1985 Vienna Convention for protection of the environment and human health against excessive amounts of harmful ultraviolet-B (UV-B, 280-315 nm) radiation reaching the Earth’s surface due to a reduced UV-B-absorbing ozone layer. The Montreal Protocol, ratified globally by all 198 Parties (countries), controls ca 100 ozone-depleting substances (ODS). These substances have been used in many applications, such as in refrigerants, air conditioners, aerosol propellants, fumigants against pests, fire extinguishers, and foam materials. The Montreal Protocol has phased out nearly 99% of ODS, including ODS with high global warming potentials such as chlorofluorocarbons (CFC), thus serving a dual purpose. However, some of the replacements for ODS also have high global warming potentials, for example, the hydrofluorocarbons (HFCs). Several of these replacements have been added to the substances controlled by the Montreal Protocol. The HFCs are now being phased down under the Kigali Amendment. As of December 2022, 145 countries have signed the Kigali Amendment, exemplifying key additional outcomes of the Montreal Protocol, namely, that of also curbing climate warming and stimulating innovations to increase energy efficiency of cooling equipment used industrially as well as domestically. As the concentrations of ODS decline in the upper atmosphere, the stratospheric ozone layer is projected to recover to pre-1980 levels by the middle of the 21st century, assuming full compliance with the control measures of the Montreal Protocol. However, in the coming decades, the ozone layer will be increasingly influenced by emissions of greenhouse gases and ensuing global warming. These trends are highly likely to modify the amount of UV radiation reaching the Earth\u27s surface with implications for the effects on ecosystems and human health. Against this background, four Panels of experts were established in 1988 to support and advise the Parties to the Montreal Protocol with up-to-date information to facilitate decisions for protecting the stratospheric ozone layer. In 1990 the four Panels were consolidated into three, the Scientific Assessment Panel, the Environmental Effects Assessment Panel, and the Technology and Economic Assessment Panel. Every four years, each of the Panels provides their Quadrennial Assessments as well as a Synthesis Report that summarises the key findings of all the Panels. In the in-between years leading up to the quadrennial, the Panels continue to inform the Parties to the Montreal Protocol of new scientific information

    A review of commercialisation mechanisms for carbon dioxide removal

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    The deployment of carbon dioxide removal (CDR) needs to be scaled up to achieve net zero emission pledges. In this paper we survey the policy mechanisms currently in place globally to incentivise CDR, together with an estimate of what different mechanisms are paying per tonne of CDR, and how those costs are currently distributed. Incentive structures are grouped into three structures, market-based, public procurement, and fiscal mechanisms. We find the majority of mechanisms currently in operation are underresourced and pay too little to enable a portfolio of CDR that could support achievement of net zero. The majority of mechanisms are concentrated in market-based and fiscal structures, specifically carbon markets and subsidies. While not primarily motivated by CDR, mechanisms tend to support established afforestation and soil carbon sequestration methods. Mechanisms for geological CDR remain largely underdeveloped relative to the requirements of modelled net zero scenarios. Commercialisation pathways for CDR require suitable policies and markets throughout the projects development cycle. Discussion and investment in CDR has tended to focus on technology development. Our findings suggest that an equal or greater emphasis on policy innovation may be required if future requirements for CDR are to be met. This study can further support research and policy on the identification of incentive gaps and realistic potential for CDR globally

    ECOS 2012

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    The 8-volume set contains the Proceedings of the 25th ECOS 2012 International Conference, Perugia, Italy, June 26th to June 29th, 2012. ECOS is an acronym for Efficiency, Cost, Optimization and Simulation (of energy conversion systems and processes), summarizing the topics covered in ECOS: Thermodynamics, Heat and Mass Transfer, Exergy and Second Law Analysis, Process Integration and Heat Exchanger Networks, Fluid Dynamics and Power Plant Components, Fuel Cells, Simulation of Energy Conversion Systems, Renewable Energies, Thermo-Economic Analysis and Optimisation, Combustion, Chemical Reactors, Carbon Capture and Sequestration, Building/Urban/Complex Energy Systems, Water Desalination and Use of Water Resources, Energy Systems- Environmental and Sustainability Issues, System Operation/ Control/Diagnosis and Prognosis, Industrial Ecology

    Reindeer Husbandry - Adaptation to the Changing Arctic, Volume 1

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    Reindeer Husbandry: Adaptation to the Changing Arctic, Volume 1 is the first of two books published by Springer Nature. This first book consists of ten peer-reviewed chapters with each chapter reviewed by two to six renowned international researchers and scientists. The authors express their immense gratitude to the reviewers and deeply acknowledge their unique contribution. This book addresses the critical issue faced by Indigenous peoples in the Arctic: climate change, the ways in which it affects their societies and livelihoods, environment, and economies. It is important that all available forms of knowledge – academic, traditional, Indigenous, and local – are included when addressing the adaptation and resilience of reindeer husbandry in the Circumpolar North. The two volumes provide novel insights into the Arctic Indigenous reindeer herding communities and how resilience can be built locally through the use of traditional knowledge and co-production

    Addressing drivers of dieback in an endangered shrub species, Persoonia hirsuta

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    Persoonia hirsuta Pers. (Proteaceae) is an Endangered shrub species endemic to the Sydney Basin region of New South Wales. This species has been in significant decline over the past two decades and is presently threatened by urban development, limited seedling recruitment, and observed dieback (a condition in which a plant begins to die from the tips of its leaves or backwards often owing to disease or an unfavourable environment) of a presently unknown cause. Understanding what causes dieback and limits new seedling recruitment is critical for the successful conservation and management of this species. The overarching goal of this research is to address key biological knowledge gaps associated with this species biology and explore potential drivers of dieback with an aim to improve the conservation and management of this species. My thesis has identified that soil pathogens, fire severity and climate change and/or environmental extremes may be involved in driving dieback and decline for P. hirsuta. However, further research is necessary to explore the intricacies of how these factors are involved in driving dieback. Additionally, these threats necessitate further conservation actions and improved management recommendations for this species. Therefore, the information in this PhD thesis has been prepared to serve in part of a NSW Threatened Species Scientific Committee Conservation Assessment as the combined results from this thesis, and other work suggest this species is eligible to be up listed to Critically Endangered. The increased understanding of ecological processes affecting dieback and decline gained from this thesis will inform future research activities and conservation recommendations for this species through improved delivery of adaptive management strategies such as translocations. Additionally, the novel strategies employed throughout thesis may improve future research associated with addressing possible drivers of dieback in native ecosystems

    Air Traffic Management Abbreviation Compendium

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    As in all fields of work, an unmanageable number of abbreviations are used today in aviation for terms, definitions, commands, standards and technical descriptions. This applies in general to the areas of aeronautical communication, navigation and surveillance, cockpit and air traffic control working positions, passenger and cargo transport, and all other areas of flight planning, organization and guidance. In addition, many abbreviations are used more than once or have different meanings in different languages. In order to obtain an overview of the most common abbreviations used in air traffic management, organizations like EUROCONTROL, FAA, DWD and DLR have published lists of abbreviations in the past, which have also been enclosed in this document. In addition, abbreviations from some larger international projects related to aviation have been included to provide users with a directory as complete as possible. This means that the second edition of the Air Traffic Management Abbreviation Compendium includes now around 16,500 abbreviations and acronyms from the field of aviation

    Reindeer Husbandry

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    This open access book focuses on climate change, Indigenous reindeer husbandry, and the underlying concept of connecting the traditional knowledge of Indigenous reindeer herders in the Arctic with the latest research findings of the world’s leading academics. The Arctic and sub-Arctic environment, climate, and biodiversity are changing in ways unprecedented in the long histories of the north, challenging traditional ways of life, well-being, and food security with legitimate concerns for the future of traditional Indigenous livelihoods. The book provides a clear and thorough overview of the potential problems caused by a warming climate on reindeer husbandry and how reindeer herders’ knowledge should be brought to action. In particular, the predicted impacts of global warming on winter climate and the resilience of the reindeer herding communities are thoroughly discussed

    Through a Model, Darkly: An Investigation of Modellers’ Conceptualisation of Uncertainty in Climate and Energy Systems Modelling and an Application to Epidemiology

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    Policy responses to climate change require the use of complex computer models to understand the physical dynamics driving change, to evaluate its impacts and to evaluate the efficacy and costs of different mitigation and adaptation options. These models are often complex and built by large teams of dedicated researchers. All modelling requires assumptions, approximations and analytic conveniences to be employed. No model is without uncertainty. Authors have attempted to understand these uncertainties over the years and have developed detailed typologies to deal with them. However, it remains unknown how modellers themselves conceptualise the uncertainty inherent in their work. The core of this thesis involves the interviews of 38 modellers from climate science, energy systems modelling and integrated assessment to understand how they conceptualise the uncertainty in their work. This study finds that there is diversity in how uncertainty is understood and that various concepts from the literature are selectively employed to organise uncertainties. Uncertainty analysis is conceived as consisting of different phases in the model development process. The interplay between the complexity of the model and the capacities of modellers to manipulate these models shapes the ways in which uncertainty can be conceptualised. How we can attempt to wrangle with uncertainty in the present is determined by the path-dependent decisions made in the past; decisions that are influenced by a variety of factors within the context of the model’s creation. Furthermore, this thesis examines the application of these concepts to another field, epidemiology, to examine their generalisability in other contexts. This thesis concludes that in a situation such as climate change, where the nature of the problem changes in a dynamic way, emphasis should be placed on reducing the grip of these path dependencies and the resource costs of adapting models to face new challenges and answer new policy questions
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