Carbon Dioxide

The accessibility concept provides a suitable framework for the achievement of sustainable land use and transport systems. Environmental and climate concerns have gained particular relevance among sustainability goals in recent years, thus reshaping political agendas all over the world. Against this background, this paper explores the practical relevance of accessibility instruments for low carbon mobility planning.
CeO2 shows unique catalytic properties by an acid–base bifunctionality as well as redox properties. The acid–base bifunctional properties of CeO2 have been applied to the non-reductive CO2 conversion with alcohols such as dimethyl carbonate (DMC) synthesis from CO2 and methanol. CeO2 shows very high selectivity to DMC; however, the yield of DMC is strongly limited by the equilibrium. The combination of the synthesis of organic carbonates from CO2 and corresponding alcohols with suitable H2O removal methods can enhance the yield of the organic carbonates beyond the equilibrium limitation.
Global warming and the acute domestic air pollution in China have necessitated transition to a sustainable energy system away from coal-dominated energy production. Through a systematic review of the national policy documents, this study investigates the policy mix adopted by the Chinese government to facilitate its energy transition and how that policy mix has evolved between 1981 and 2020. The chronological analysis emphasizes two dimensions of temporal changes in the policy mix: (1) changes in the policy intensity and density, and (2) the shift in policy instrument combinations.
Reductions in carbon emissions have been a focus of the power sector. However, the sector itself is vulnerable to the impacts of global warming. Extreme weather events and gradual changes in climate variables can affect the reliability, cost, and environmental impacts of the energy supply. This paper analyzed the interplay between CO2 mitigation attempts and adaptations to climate change in the power sector using the Long-range Energy Alternative Planning System (LEAP) model.
The two-dimensional (2D) ultrathin Mg-Al layered double hydroxide modified by magnetic Fe3O4 (Fe3O4/Mg-Al LDH) was successfully synthesized via the co-precipitation method. The Fe3O4/Mg-Al LDH not only exhibits superior separation efficiency of charge carriers but also possesses signally enhanced photocatalytic activity for CO2 reduction than Mg-Al LDH. The as-prepared Fe3O4/Mg-Al LDH affords the CO and CH4 generation rate of 442.2 µmol g−1 h−1 and 223.9 µmol g−1 h−1. The enhanced reduction CO2 activity mainly comes from synergetic effect of Fe3O4 and ultrathin Mg-Al LDH.
Elsevier, Renewable and Sustainable Energy Reviews, Volume 112, September 2019
This review gives a worldwide overview on Power-to-Gas projects producing hydrogen or renewable substitute natural gas focusing projects in central Europe. It deepens and completes the content of previous reviews by including hitherto unreviewed projects and by combining project names with details such as plant location.
Manual chamber-based measurements of CO2 (and H2O) fluxes are important for understanding ecosystem carbon metabolism. Small opaque chambers can be used to measure leaf, stem and soil respiration. Larger transparent chambers can be used to measure net ecosystem exchange of CO2, and small jars often serve this purpose for laboratory incubations of soil and plant material. We developed an Android application (app), called Flux Puppy, to facilitate chamber-based flux measurements in the field and laboratory.
Elsevier, Veterinary Anaesthesia and Analgesia, Volume 46, July 2019
Objective: Attention is drawn to the potential of global warming to influence the health and wellbeing of the human race. There is increasing public and governmental pressure on healthcare organisations to mitigate and adapt to the climate changes that are occurring. The science of anaesthetic agents such as nitrous oxide and the halogenated anaesthetic agents such as greenhouse gases and ozone-depleting agents is discussed and quantified. Additional environmental impacts of healthcare systems are explored.
Irrigation management may influence soil greenhouse gas emissions (GHG). Solid-set sprinkler irrigation systems allow to modify the irrigation time and frequency. The objective of this study was to quantify the effect of two irrigation times (daytime, D; nighttime, N)and two irrigation frequencies (low, L; high, H)on soil carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O)emissions in a solid-set sprinkler-irrigated maize (Zea mays L.)field located in NE Spain during 2015 and 2016 growing seasons and the fallow period between growing seasons.