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Waste collection is one of the most relevant parts of the integrated solid waste management system in technical, economic, environmental, and social terms. However, the vital role of waste collection has not been recognized, and the support given by the quadruple helixacademics, industry, state, and citizensis reduced when looking for the other operational units of an integrated solid waste management system. To exemplify the missing interest of academia for waste collection, in a Google Scholar search, the results for "waste collection" are about 157,000, for incineration are 375,000, and for landfill are 639,000. This example shows that collection is seen only as the way to make waste to get into high-tech infrastructures, like incineration plants, where real science is applied. The practitioners of the waste collection are the range of workers with lower income backgrounds, making waste collection not attractive enough to be devoted to high-tech solutions for waste collection problems. Many times, waste managers working in waste collection systems are more focused on the trucks and containers and the costs involved in the collection process, which is a considerable amount of local authorities' budget.In a meeting in 2014 between academia and waste collection sectors at the Nova University of Lisbon, waste collection professionals expressed the need for technical skills and knowledge based on waste collection and management practice, in a bottom-up approach. Technical skill areas include cost-efficiency, recycling behavior, environmental impacts, and technical operation. Waste collection professionals all over the world have the same necessities when implementing and managing a waste collection system to know more about the subject, but in such a way that knowledge could be affordable in technical and economic terms.The waste collection professionals' call to fulfill the technical background needs required experts in several fields of waste collection and management. This book results from the collaboration from different science areas and experiences in waste collection and management. Dr. Ana Pires, from whom the original idea was formed, has a scientific role in analyzing solid waste management from a system analysis perspective, where the application of life cycle assessment and multi-criteria decision-making are the techniques applied by her to make waste collection and

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Fluorinated greenhouse gases (F-gases) are used for various applications, such as in refrigeration and air conditioning, as substitutes of the ozone-depleting substances. Their utilization has increased drastically over the last few decades, with serious consequences for global warming. The Kigali Amendment to the Montreal Protocol and several national and international legislations, such as the 2014 EU F-gas Regulation, aim to control the utilization and emissions of these gases. In the EU, the phase-down of hydrofluorocarbons (HFCs) is underway, with successive reductions in quotas up to 2050. Under this scenario, efficient strategies for managing the produced and already existing F-gases are of vital importance to guarantee that their effect on the environment is mitigated. Up to now, most of the F-gases recovered from end-of-life equipment or when retrofitting systems are either released into the atmosphere or destroyed. However, in order to put forward a cost-efficient adaptation to the F-gas phase-down, increasing separation and recycling efforts must be made. This critical review aims at providing a revision of the current F-gas management problems and strategies and providing an overview on the innovative strategies that can be applied to contribute to build a sustainable market under circular economy principles.