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Three Coupled Model Intercomparison Project Phase 5 models involved in the G4 experiment of the Geoengineering Model Inter-comparison Project (GeoMIP) project were used to investigate the impact of stratospheric aerosol injection (SAI) on the mean surface air temperature and precipitation extremes in Africa.

This impact was examined under G4 and Representative Concentration Pathway (RCP) 4.5 scenarios on the total precipitation, the number of rainy days (RR1) and of days with heavy rainfall (R20 mm), the rainfall intensity (SDII), the maximum length of consecutive wet (CWD) and dry (CDD) days and on the maximum rainfall in five consecutive days (Rx5day) across four regions: Western Africa (WAF), Eastern Africa (EAF), Northern Africa and Southern Africa (SAF).

During the 50 years (2020–2069) of SAI, mean continental warming is −0.40°C lower in G4 than under RCP4.5. During the post-injection period (2070–2090), the temperature continues to increase, but at a lower rate (−0.19°C) than in RCP4.5. During SAI, annual rainfall in G4 is significantly greater than in RCP4.5 over the high latitudes (especially over SAF) and lower over the tropics. The termination of SAI leads to a significant increase of rainfall over Sahel and EAF and a decrease over SAF and Guinea Coast (WAF).

Compared to RCP4.5, SAI will contribute to reducing significantly regional warming but with a significant decrease of rainfall in the tropics where rainfed agriculture account for a large part of the economies. After the SAI period, the risk of drought over the extratropical regions (especially in SAF) will be mitigated, while the risk of floods will be exacerbated in the Central Sahel.

To meet the Paris Agreement, African countries will implement mitigation measures to contribute to keep the surface air temperature below 2°C. Geoengineering with SAI is suggested as an option to meet this challenge, but its implication on the African climate system needs a deep investigation in the aim to understand the impacts on temperature and precipitation extremes. To the best of the authors’ knowledge, this study is the first to investigate the potential impact of SAI using the G4 experiment of GeoMIP on temperature and precipitation extremes of the African continent.

Climate engineering management (CEM) as an emerging and cross-disciplinary subject gradually draws the attention to researchers. This paper aims to focus on economic and social impacts on the technologies of climate engineering themselves. However, very few research concentrates on the management of climate engineering. Furthermore, scientific knowledge and a unified system of CEM are limited.

In this paper, the concept of CEM and its characteristics are proposed and elaborated. In addition, the framework of CEM is established based on management objectives, management processes and supporting theory and technology of management. Moreover, a multi-agent synergistic theory of CEM is put forward to guide efficient management of climate engineering, which is composed of time synergy, space synergy, and factor synergy. This theory is suitable for solving all problems encountered in the management of various climate engineering rather than a specific climate engineering. Specifically, the proposed CEM system aims to mitigate the impact of climate change via refining and summarizing the interrelationship of each component.

Overall, the six research frontiers and hotspots in the field of CEM are explored based on the current status of research.

In terms of the objectives listed above, this paper seeks to provide a reference for formulating the standards and norms in the management of various climate engineering, as well as contribute to policy implementation and efficient management.

Currently, negotiation on global carbon emissions reduction is very difficult owing to lack of international willingness. In response, geoengineering (climate engineering) strategies are proposed to artificially cool the planet. Meanwhile, as the harbor around one-third of all described marine species, coral reefs are the most sensitive ecosystem on the planet to climate change. However, until now, there is no quantitative assessment on the impacts of geoengineering on coral reefs. This study aims to model the impacts of stratospheric aerosol geoengineering on coral reefs.

The HadGEM2-ES climate model is used to model and evaluate the impacts of stratospheric aerosol geoengineering on coral reefs.

This study shows that (1) stratospheric aerosol geoengineering could significantly mitigate future coral bleaching throughout the Caribbean Sea; (2) Changes in downward solar irradiation, sea level rise and sea surface temperature caused by geoengineering implementation should have very little impacts on coral reefs; (3) Although geoengineering would prolong the return period of future hurricanes, this may still be too short to ensure coral recruitment and survival after hurricane damage.

This is the first time internationally to quantitatively assess the impacts of geoengineering on coral reefs.

The purpose of this paper is to show that the observed strong link between global economic output and primary energy use will continue in future; and attempts to replace fossil fuels with alternative energy sources or implementing CO₂ removal or geoengineering approaches cannot provide the level of clean energy that economic growth needs. Global economic growth, therefore, is unlikely to continue for much longer.

The paper uses historical and recent global data (2012) for energy output from various sources, economic output and CO₂, emissions to make its case.

Alternative energy output is growing too slowly, and faces too many problems, to significantly change the energy mix in the coming decades. Continued use of fossil fuels requires either massive CO₂ removal/sequestration or global solar radiation management (SRM). The first is too expensive and would take decades to be significant, the second carries risks, some already known and possibly also unknown ones.

The paper makes the case that technical fixes such as alternative fuels, energy efficiency improvements, carbon dioxide capture and SRM will not be sufficient to prevent global climate change.

Social change, rather than reliance on technical fixes, is needed for ecologically sustainable economies.

Most research argues that global energy intensity and carbon intensity will continue to fall. In contrast, we argue that the strong link observed between global economic output and primary energy use will most likely continue.

This paper describes the current (April 1989) problems of finding substitutes for chlorofluorocarbon (CFC) solvents which are becoming regulated for environmental reasons. The cleaning products discussed are hydrochlorofluorocarbons, hydrochlorocarbons, chlorocarbons, water, aqueous saponifiers, light hydrocarbons and terpene/surfactant mixtures. These are examined primarily from the points of view of air and water pollution and operator health and safety. Secondarily, the factors of cost and cleaning efficiency are discussed.

The purpose of this paper is to understand how the 2015 Tianjin Port explosion – which resulted in more than 100 deaths – changed local residents’ acceptance, perceived benefit and risk and trust related to hazardous goods warehouses and chemical plants (HGWCPs) and how it influenced local residents’ decisions about accepting HGWCPs through the lens of the trust heuristic.

A survey was conducted eight months after the disaster. Respondents were classified into two groups: involved (with direct experience of the explosion) and uninvolved (without direct experience). Their trust in those responsible for HGWCPs, and perceived benefit, perceived risk and acceptance associated with HGWCPs were surveyed.

The disaster reduced public acceptance of HGWCPs and trust and increased perceived risk. Trust retained an indirect effect on acceptance through perceived benefit in both groups and a direct effect on acceptance in the involved group. Trust partly accounted for the reduction in acceptance of HGWCPs.

Results remind the local government of the medium-term psychological consequences of the Tianjin Port explosion (e.g. increased perceived risk and reduced trust) and suggest the importance of building trust in mitigating risk perceptions of relevant technological hazards.

It represents a valuable addition to the literature on the medium-term psychological consequences of technological disasters and on the public’s decision making about hazardous technologies.

Aurora Flight Sciences and NASA is conducting a flight readiness review of the company's Perseus A drone.