The world's population is now over 50% urban, and cities make an important contribution to national greenhouse gas (GHG) emissions. Many cities are developing strategies to reduce their emissions. Here we ask how and why emissions differ between cities. Our study of ten global cities shows how a balance of geophysical factors (climate, access to resources, and gateway status) and technical factors (power generation, urban design, and waste processing) determine the GHGs attributable to cities. Within the overall trends, however, there are differences between cities with more or less public transit; while personal income also impacts heating and industrial fuel use. By including upstream emissions from fuels, GHG emissions attributable to cities exceed those from direct end use by up to 25%. Our findings should help foster intercity learning on reducing GHG emissions.
We apply the ExternE method, based on impact pathway approach, utilizing the newest updates and improvements to the method. The external costs attributable to energy transformation and transportation caused by air pollution are assessed. External costs for the energy sector in the Czech Republic, Hungary and Poland are estimated. In addition, externalities for transport sector are also quantified for the Czech Republic. Power plants and vehicles used are inventoried. The assessment of the external costs required, in addition to the collection of data, the adaptation of certain parts of the EcoSense software. Monetary valuation of health end points is also analysed and possible valuation for other endpoints is discussed. This WP was carried out by research institutes located in the Czech Republic (Charles University Environment Center - CUP/CUEC) and in Poland (Mineral and Energy Economy Research Institute of Polish Academy of Sciences - MEERI). The approach followed these project tasks: Review ExternE methodology Provide information on costs of health effects Discuss of data on costs and inventory of materials possible damaged by air pollution Modify the EcoSense software as appropriate Obtain data on inventory ofpower plants, cars, buses, and railways, and on their emission of pollutants Calculate the corresponding damage costs in Czech Republic, Hungary and Poland.
Abstract: Net additions to stock (NAS) are an indicator based on economy‐wide material flow accounting and analysis. NAS, a measure of the physical growth rate of an economy, can be used for estimates of future waste flows. It is calculated using two methods: The indirect method of calculation is a simple difference between all input and output flows, whereas the direct method involves measuring the amounts of materials added to particular categories of physical stock and the amounts of waste flows from these stocks. The study described in this article had one leading objective: to make available direct NAS data for the Czech Republic, which could later be used for predicting future waste flows. Two additional objectives emerged from the first: (1) to develop a method for direct NAS calculation from data availability in the Czech Republic; (2) to calculate NAS directly, compare the results with those achieved in indirect NAS calculation, and discuss the identified differences. The NAS for the Czech Republic calculated by the direct method is equal to approximately 65 million tonnes on average in 2000–2002 and is approximately 27% lower than the NAS acquired by the indirect method of calculation. The actual values of directly calculated NAS and its uncertainties suggest that the indirect NAS is more likely to be an overestimation than an underestimation. Durables account for about 2% of the total direct NAS, whereas the rest is attributed to infrastructure and buildings. The direct NAS is dominated by nonmetal construction commodities such as building stone and bricks, which equal approximately 89% of the total direct NAS. Calculation of NAS by the direct method has been proved to be feasible in the Czech Republic. Moreover, uncertainties related to direct NAS are lower than those related to indirectly acquired NAS.