scholarly journals Innovation to zero emissions: nuclear energy trough nonproliferation and environment protection- Romanian experience for GEN 4

2022 ◽  
Vol 960 (1) ◽  
pp. 012001
Author(s):  
M Valeca ◽  
S Valeca ◽  
D Giosanu

Abstract The UN Intergovernmental Panel on Climate Change (NY 2019) has concluded that nations must move more swiftly to reduce emissions of carbon dioxide, methane, and other greenhouse gases to avoid the most devastating effects of global warming. The paper presents nuclear energy as part of the solution. Due to the fact that the population is concerned about nuclear proliferation, plant safety and radiation protection, the paper presents the Romanian experience regarding the reduction of the risk of proliferation as well as the project of the 4th generation reactor ALFRED. One of the most important steps in assessing the candidate materials for Generation IV reactors is the material performance under neutron irradiation. In this respect, the paper also presents the results of the evaluations on some potential materials to be used in fast lead cooled reactors.

2021 ◽  
Vol 19 (1) ◽  
pp. 93-100
Author(s):  
Marvin Du

Natural gas well blowouts can release a large amount of methane along with other greenhouse gases. According to the Intergovernmental Panel on Climate Change, the global warming potential (GWP) of fossil methane is 30 times higher than that of carbon dioxide in a 100-year time horizon. Here, we show that combustion can be used as a means to significantly reduce the global warming effect of greenhouse emissions from gas well blowouts: up to 90 percent of the effect can be eliminated by combusting the released natural gas. The 2015 Aliso Canyon storage well blowout is used as an example.


1999 ◽  
Vol 26 (3) ◽  
pp. 166-168 ◽  
Author(s):  
TIM NEWCOMB

Many nations have recognized the need to reduce the emissions of greenhouse gases (GHGs). The scientific assessments of climate change of the Intergovernmental Panel on Climate Change (IPCC) support the need to reduce GHG emissions. The 1997 Kyoto Protocol to the 1992 Convention on Climate Change (UNTS 30822) has now been signed by more than 65 countries, although that Protocol has not yet entered into force. Some 14 of the industrialized countries listed in the Protocol face reductions in carbon dioxide emissions of more than 10% compared to projected 1997 carbon dioxide emissions (Najam & Page 1998).


Author(s):  
J Davison ◽  
K Thambimuthu

There is growing concern about climate change resulting from increasing concentrations of greenhouse gases (GHGs) in the atmosphere. Several techniques including efficiency improvements and increased use of renewable energy sources will be needed to limit emissions of greenhouse gases to the atmosphere. Another technique that can help to reduce emissions substantially is capture and storage of CO2 (CCS). This article will describe the main technologies that can be used to capture CO2 from coal- and gas-fired power plants, including postcombustion capture, precombustion capture, and oxy-combustion. The current status of these technologies, their performance and costs, and possible future developments will be reviewed. The article considers changes in CO2 capture technologies, fuel costs, and plant construction costs that have occurred since the Intergovernmental Panel on Climate Change (IPCC) Special Report on CCS was written. The article will draw on work carried out by the IEA Greenhouse Gas R&D Programme and other leading organizations working in this field. The analysis concentrates on coal-based gasification combined cycle power plants with precombustion capture and pulverized coal combustion plant with postcombustion capture.


Author(s):  
Shamshad Akhtar ◽  
Muhammad Rafique Dhanani

Climate change is not the new phenomenon. The palaeo-climatic studies reveal that during the Pleistocene and Holocene periods several warm and cold periods occurred, resulted change of sea level and change in climatic processes like rise and fall of global average temperature and rainfall. The last medieval warm period was observed from 950 to 1350 AD, followed by the little Ice Age from 1400 to 1900 AD. Occurrence of these climatic changes and their impacts are considered due to natural processes that are geological and astronomical. In 1970s environmentalists and some climate scientists pointed that earth’s average temperature is rising linked with the anthropogenic causes of global warming and emission of carbon dioxide through fossil fuels. In late 1980s the problem was discussed in politics and media. To examine and monitor the global rise of temperature and its impacts due to the emission of carbon dioxide an organization of Intergovernmental Panel on Climate Change (IPCC) was created in 1988 by United Nations Environment Programme (UNEP). The IPCC released several reports based upon anthropogenic causes of climate change and their impacts. According to IPCC, 2007 report on climate change during the last 100 years the earth’s average temperature has increased up to 0.6 degree Celsius and if emission of greenhouse gases particularly carbon dioxide continues to rise, global temperature will rise up to 5.8 degrees Celsius by the end of 2100 AD. Similarly as a result of this threat of global warming, glaciers will disappear even from Antarctica and Arctic sea will open for navigation throughout the year. Many islands and coastal cities will submerge as a result of sea level rise. In 2004 Canadian Broadcasting T.V presented a documentary with the name “ The doomsday called off” in which leading climate scientists, astrophysicist and geophysicist presented evidences that science of global warming presented by IPCC scientists is incomplete and incorrect based upon computer models and stimulations which are deliberately exaggerated. Many climate scientists have shown disassociation with the IPCC views and speculations on the basis of its doubtful manipulated and exaggerated figures of global warming and some consider it a climate scam. Since then debate between UN pro man-made global warming scientists and anti-man-made global warming climate scientists continue.


2020 ◽  
Author(s):  
Aylin Boztepe ◽  
Tanıl Tarhan ◽  
Zeynep Gülsoy Şerif ◽  
Adnan Şimşek

<p>Climate change is one of the most urgent issues facing humanity today. Humans have been rapidly changing the balance of gases in the atmosphere which causes global warming. Burning fossil fuels like coal and oil, farming and forestry, agriculture and cement manufacture cause to release water vapor, carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>), ozone and nitrous oxide (N<sub>2</sub>O) known as the primary greenhouse gases. According to Intergovernmental Panel on Climate Change (IPCC), carbon dioxide is the most common greenhouse gas absorbing infrared energy emitted from the earth, preventing it from returning to space. It is necessary to separate man-made (anthropogenic) emissions from natural contributions in the atmosphere to obtain accurate emission data [1-4]. Since it could not be achieved with the existing metrological infrastructure, it is required to develop the measurements and references of stable isotopes of CO<sub>2</sub>. In this study, static and dynamic reference materials for pure CO<sub>2</sub> at 400 µmol/mol in air matrix were prepared and it was provided to simulate CO<sub>2</sub> gas in the atmosphere.</p><p>The static gas mixtures were prepared gravimetrically in accordance with the ISO 6142-1 standard. In order to obtain CO<sub>2</sub> gas at desired isotopic compositions, commercial CO<sub>2</sub> gases were also supplied from abroad. Their isotopic compositions were measured by using GC-IRMS. Before filling, aluminum cylinders were evacuated until the pressure of 10<sup>-7</sup> mbar using turbo-molecular vacuum pump. Isotopic compositions of reference materials were determined in a way that covering the range -42 ‰ to +1 ‰ vs VPDB for d<sup>13</sup>C-CO2 and -35 ‰ to -8 ‰ vs VPDB for d<sup>18</sup>O. In order to develop static and dynamic reference materials of CO<sub>2</sub> at 400 µmol/mol in air with the uncertainty targets of d<sup>13</sup>C-CO<sub>2</sub> 0.1 ‰ and d<sup>18</sup>O-CO<sub>2</sub> 0.5 ‰, previously prepared pure CO<sub>2</sub> reference gases were used. Dynamic dilution system with the high accuracy was constructed to generate dynamic reference gas mixture of CO<sub>2</sub> at 400 µmol/mol. System contains 3 electronic pressure controllers, 3 thermal mass flow controllers with various capacities and 3 molbloc-L flow elements commanded with 2 Molboxes. The isotopic compositions of dynamic reference gas mixtures of CO<sub>2</sub> at 400 µmol/mol were aimed to be same with the previously prepared pure CO<sub>2</sub> reference gases. The whole dilution system were calibrated at INRIM to achieve lower uncertainties around 0.07-0.09%. At the measurement stage, CRDS and GC-IRMS equipments are operated simultaneously to determine the concentrations and isotopic compositions of the gas mixtures. The amount of substance fractions of the dynamic reference mixtures are calculated according to ISO 6145-7 standard. It will be checked that whether the isotopic compositions of the gravimetrically prepared pure CO<sub>2</sub> reference gases and the dynamic reference gas mixtures of CO<sub>2</sub> at 400 µmol/mol were same or not.</p><p><strong>REFERENCES</strong></p><p>[1] Calabro P. S., “Greenhouse gases emission from municipal waste management: The role of separate collection”, Waste Management, Volume 29:7, 2178-2187, 2009.</p><p>[2] Sources of Greenhouse Gas Emissions, United States Environmental Protection Agency, https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions, 2019.</p><p>[3] Schwartz, S.E., “The Greenhouse Effect and Climate Change”, 2017.</p><p>[4] Climate Change, The Intergovernmental Panel on Climate Change, https://www.ipcc.ch/report/ar4/wg1, 2019.</p>


1991 ◽  
Vol 20 (2) ◽  
pp. 151-163
Author(s):  
Harry M. Kaiser

Without a doubt, climate change will be one of the most important environmental topics of the 1990s and will be high on the research agendas of many scientific disciplines in years ahead. While not yet universally accepted, it is now widely believed that anthropogenic emissions of carbon dioxide and other “greenhouse” gases have the potential to substantially warm climates worldwide. Although there is no consensus on the timing and magnitude of global warming, current climate models predict an average increase of 2.8°C to 5.2°C in the earth's temperature over the next century (Karl, Diaz, and Barnett). Changes in regional temperature and precipitation will likely accompany the global warming, but there is even less scientific agreement on the magnitude of these changes.


2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Angela Margaret Evans

Abstract Background Healthcare aims to promote good health and yet demonstrably contributes to climate change, which is purported to be ‘the biggest global health threat of the 21st century’. This is happening now, with healthcare as an industry representing 4.4% of global carbon dioxide emissions. Main body Climate change promotes health deficits from many angles; however, primarily it is the use of fossil fuels which increases atmospheric carbon dioxide (also nitrous oxide, and methane). These greenhouse gases prevent the earth from cooling, resulting in the higher temperatures and rising sea levels, which then cause ‘wild weather’ patterns, including floods, storms, and droughts. Particular vulnerability is afforded to those already health compromised (older people, pregnant women, children, wider health co-morbidities) as well as populations closer to equatorial zones, which encompasses many low-and-middle-income-countries. The paradox here, is that poorer nations by spending less on healthcare, have lower carbon emissions from health-related activity, and yet will suffer most from global warming effects, with scant resources to off-set the increasing health care needs. Global recognition has forged the Paris agreement, the United Nations sustainable developments goals, and the World Health Organisation climate change action plan. It is agreed that most healthcare impact comes from consumption of energy and resources, and the production of greenhouse gases into the environment. Many professional associations of medicine and allied health professionals are advocating for their members to lead on environmental sustainability; the Australian Podiatry Association is incorporating climate change into its strategic direction. Conclusion Podiatrists, as allied health professionals, have wide community engagement, and hence, can model positive environmental practices, which may be effective in changing wider community behaviours, as occurred last century when doctors stopped smoking. As foot health consumers, our patients are increasingly likely to expect more sustainable practices and products, including ‘green footwear’ options. Green Podiatry, as a part of sustainable healthcare, directs us to be responsible energy and product consumers, and reduce our workplace emissions.


1996 ◽  
Vol 7 (4) ◽  
pp. 333-348 ◽  
Author(s):  
Patrick J. Michaels ◽  
Paul C. Knappenberger

Climate data support the “moderate” prediction of climate change (l-1.5°C) rather than the more extreme scenario (4°C or more). The moderate point of view was originally marginalized in the IPCC “consensus” process in both the 1990 First Assessment on Climate Change and in the 1992 Update prepared specifically for the Earth Summit and to provide backing for the Rio Framework Convention on Climate Change. It is now accepted, based on ground-based data, that the errors in those models are currently between 160% and 360%. If one compares them to the satellite data combined with the land record, the error rises to a maximum of 720%. In some recognition of this massive error, the 1995 IPCC “consensus” is that warming has been mitigated by sulfate aerosols. However, when that hypothesis is specifically tested, it fails. Further, data required to test the validity of the sulfate enhanced greenhouse models was withheld by the IPCC. despite repeated requests.


2021 ◽  
pp. 1-13
Author(s):  
Kehan Li

Climate change is of great importance in modern times and global warming is considered as a significant part of climate change. It is proved that human’s emissions such as greenhouse gases are one of the main sources of global warming (IPCC, 2018). Apart from greenhouse gases, there is another kind of matter being released in quantity via emissions from industries and transportations and playing an important role in global warming, which is aerosol. However, atmospheric aerosols have the net effect of cooling towards global warming. In this paper, climate change with respect to global warming is briefly introduced and the role of aerosols in the atmosphere is emphasized. Besides, properties of aerosols including dynamics and thermodynamics of aerosols as well as interactions with solar radiation are concluded. In the end, environmental policies and solutions are discussed. Keywords: Climate change, Global warming, Atmospheric aerosols, Particulate matter, Radiation, Environmental policy.


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