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"GREENHOUSE GASES"
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Environmental co-benefits and adverse side-effects of alternative power sector decarbonization strategies
A rapid and deep decarbonization of power supply worldwide is required to limit global warming to well below 2 °C. Beyond greenhouse gas emissions, the power sector is also responsible for numerous other environmental impacts. Here we combine scenarios from integrated assessment models with a forward-looking life-cycle assessment to explore how alternative technology choices in power sector decarbonization pathways compare in terms of non-climate environmental impacts at the system level. While all decarbonization pathways yield major environmental co-benefits, we find that the scale of co-benefits as well as profiles of adverse side-effects depend strongly on technology choice. Mitigation scenarios focusing on wind and solar power are more effective in reducing human health impacts compared to those with low renewable energy, while inducing a more pronounced shift away from fossil and toward mineral resource depletion. Conversely, non-climate ecosystem damages are highly uncertain but tend to increase, chiefly due to land requirements for bioenergy.
There lacks a consistent and holistic evaluation of co-benefits of different mitigation pathways in studies on Integrated Assessment Models. Here the authors quantify environmental co-benefits and adverse side-effects of a portfolio of alternative power sector decarbonisation pathways and show that the scale of co-benefits as well as profiles of adverse side-effects depend strongly on technology choice.
Journal Article
Greenhouse gases
\"Discusses the environmental issue of greenhouse gases and how to create a sustainable way of living\"--Provided by publisher.
Book
Future temperature extremes threaten land vertebrates
The frequency, duration, and intensity of extreme thermal events are increasing and are projected to further increase by the end of the century
1
,
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. Despite the considerable consequences of temperature extremes on biological systems
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–
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, we do not know which species and locations are most exposed worldwide. Here we provide a global assessment of land vertebrates’ exposures to future extreme thermal events. We use daily maximum temperature data from 1950 to 2099 to quantify future exposure to high frequency, duration, and intensity of extreme thermal events to land vertebrates. Under a high greenhouse gas emission scenario (Shared Socioeconomic Pathway 5–8.5 (SSP5–8.5); 4.4 °C warmer world), 41.0% of all land vertebrates (31.1% mammals, 25.8% birds, 55.5% amphibians and 51.0% reptiles) will be exposed to extreme thermal events beyond their historical levels in at least half their distribution by 2099. Under intermediate-high (SSP3–7.0; 3.6 °C warmer world) and intermediate (SSP2–4.5; 2.7 °C warmer world) emission scenarios, estimates for all vertebrates are 28.8% and 15.1%, respectively. Importantly, a low-emission future (SSP1–2.6, 1.8 °C warmer world) will greatly reduce the overall exposure of vertebrates (6.1% of species) and can fully prevent exposure in many species assemblages. Mid-latitude assemblages (desert, shrubland, and grassland biomes), rather than tropics
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,
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, will face the most severe exposure to future extreme thermal events. By 2099, under SSP5–8.5, on average 3,773 species of land vertebrates (11.2%) will face extreme thermal events for more than half a year period. Overall, future extreme thermal events will force many species and assemblages into constant severe thermal stress. Deep greenhouse gas emissions cuts are urgently needed to limit species’ exposure to thermal extremes.
Future extreme thermal events will force many vertebrate species and assemblages into constant severe thermal stress; however, lowering emissions would greatly reduce overall exposures.
Journal Article
Numerical Study on the Impact of Reservoir Heterogeneity on Utilization of CO2 and Optimization Strategies in Low-Permeability Reservoirs
The intensification of the global climate crisis has thrust the imperative of controlling greenhouse gas emissions into the spotlight, commanding the attention of individuals, industries, and nations alike. Reducing carbon emissions and maximizing carbon utilization have assumed paramount significance in the contemporary industrial landscape. Within this overarching context, Carbon Capture, Utilization, and Storage (CCUS) technology has emerged as a transformative and pivotal means of addressing the multifaceted challenges posed by escalating emissions.Among the diverse CCUS methodologies, enhanced oil recovery (EOR) has distinguished itself as an up-and-coming technique, offering economic viability and environmental impact. Simultaneously, enhanced gas recovery (EGR) has recently gained momentum due to its remarkable potential as a negative carbon technology.This study employs an integrated approach to gain a deeper and more precise understanding of how reservoir heterogeneity influences the geological utilization of CO2.It commences with the utilization of FLAC3D and the \"gast\" tool in R language to generate comprehensive data fields that quantitatively characterize heterogeneity in terms of porosity standard deviation and correlation length. Subsequently, the research conducts a comprehensive and methodical analysis of how heterogeneity impacts CO2 gas displacement.
eBook
Mitigation potential of global ammonia emissions and related health impacts in the trade network
Ammonia (NH
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) emissions, mainly from agricultural sources, generate substantial health damage due to the adverse effects on air quality. NH
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emission reduction strategies are still far from being effective. In particular, a growing trade network in this era of globalization offers untapped emission mitigation potential that has been overlooked. Here we show that about one-fourth of global agricultural NH
3
emissions in 2012 are trade-related. Globally they induce 61 thousand PM
2.5
-related premature mortalities, with 25 thousand deaths associated with crop cultivation and 36 thousand deaths with livestock production. The trade-related health damage network is regionally integrated and can be characterized by three trading communities. Thus, effective cooperation within trade-dependent communities will achieve considerable NH
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emission reductions allowed by technological advancements and trade structure adjustments. Identification of regional communities from network analysis offers a new perspective on addressing NH
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emissions and is also applicable to agricultural greenhouse gas emissions mitigation.
Ammonia emissions from agricultural sources can cause severe health impacts. Here, the authors show that about 25% of global agricultural ammonia emissions in 2012 were related to international exported goods and caused 61 thousand PM2.5 related premature deaths, which points out large ammonia mitigation potential in international trade.
Journal Article
River ecosystem metabolism and carbon biogeochemistry in a changing world
River networks represent the largest biogeochemical nexus between the continents, ocean and atmosphere. Our current understanding of the role of rivers in the global carbon cycle remains limited, which makes it difficult to predict how global change may alter the timing and spatial distribution of riverine carbon sequestration and greenhouse gas emissions. Here we review the state of river ecosystem metabolism research and synthesize the current best available estimates of river ecosystem metabolism. We quantify the organic and inorganic carbon flux from land to global rivers and show that their net ecosystem production and carbon dioxide emissions shift the organic to inorganic carbon balance en route from land to the coastal ocean. Furthermore, we discuss how global change may affect river ecosystem metabolism and related carbon fluxes and identify research directions that can help to develop better predictions of the effects of global change on riverine ecosystem processes. We argue that a global river observing system will play a key role in understanding river networks and their future evolution in the context of the global carbon budget.
Journal Article