scholarly journals A global environmental crisis 42,000 years ago

Science ◽  
2021 ◽  
Vol 371 (6531) ◽  
pp. 811-818
Author(s):  
Alan Cooper ◽  
Chris S. M. Turney ◽  
Jonathan Palmer ◽  
Alan Hogg ◽  
Matt McGlone ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Climate Modeling ◽  
Global Climate ◽  
Environmental Crisis ◽  
Global Environmental ◽  
Climate Shifts ◽  
Magnetic Inversion ◽  
Global Impacts ◽  
Extinction Events ◽  
Magnetic Poles

Geological archives record multiple reversals of Earth’s magnetic poles, but the global impacts of these events, if any, remain unclear. Uncertain radiocarbon calibration has limited investigation of the potential effects of the last major magnetic inversion, known as the Laschamps Excursion [41 to 42 thousand years ago (ka)]. We use ancient New Zealand kauri trees (Agathis australis) to develop a detailed record of atmospheric radiocarbon levels across the Laschamps Excursion. We precisely characterize the geomagnetic reversal and perform global chemistry-climate modeling and detailed radiocarbon dating of paleoenvironmental records to investigate impacts. We find that geomagnetic field minima ~42 ka, in combination with Grand Solar Minima, caused substantial changes in atmospheric ozone concentration and circulation, driving synchronous global climate shifts that caused major environmental changes, extinction events, and transformations in the archaeological record.

Aesthetic Appreciation of Nature and the Global Environmental Crisis

2021 ◽  
Author(s):  
Jukka Mikkonen
Keyword(s):  
Climate Change ◽  
Global Climate Change ◽  
Aesthetic Experience ◽  
Global Climate ◽  
Global Environmental Change ◽  
Aesthetic Judgment ◽  
Environmental Crisis ◽  
Global Environmental ◽  
Nature Appreciation ◽  
The Aesthetic

Global climate change has been characterised as the crisis of reason (Val Plumwood), imagination (Amitav Ghosh) and language (Elizabeth Rush), to mention some. The ‘everything change’, as Margaret Atwood calls it, arguably also impacts on how we aesthetically perceive, interpret and appreciate nature. This article looks at philosophical theories of nature appreciation against global environmental change. The article examines how human-induced global climate change affects the ‘scientific’ approaches to nature appreciation which base aesthetic judgment on scientific knowledge and the competing ‘non-scientific’ approaches which emphasise the role of emotions, imagination and stories in the aesthetic understanding of environment. The author claims that both approaches are threatened by global climate change and cannot continue as usual. In particular, he explores aesthetic imagination in contemporary times when our visions about environment are thoroughly coloured by worry and uncertainty and there seems to be little room for awe and wonder, which have traditionally characterised the aesthetic experience of nature. Finally, he proposes that art could stimulate environmental imagining in this age of uncertainty.

scholarly journals The Adams Event, a geomagnetic-driven environmental crisis 42,000 years ago

2020 ◽  
Author(s):  
Alan Cooper ◽  
Chris Turney ◽  
Keyword(s):  
Geomagnetic Field ◽  
Environmental Changes ◽  
Critical Issue ◽  
Environmental Crisis ◽  
Climate Modelling ◽  
Environmental Consequences ◽  
Wide Range ◽  
Obvious Association ◽  
Paleoclimate Records ◽  
Extinction Events

<p><strong>Geological archives record multiple reversals of Earth’s magnetic poles, yet the potential impacts of these events remain unknown. The lack of any obvious association between the last major inversion, the Laschamps Excursion ~41 thousand years ago (ka), and polar ice paleoclimate records has underpinned the view that geomagnetic reversals do not have major environmental consequences. We find this is not the case. Importantly, the weakened geomagnetic field causes rapid production of atmospheric radiocarbon, and the lack of accurate calibration records has complicated dating of environmental and archaeological events in other parts of the world. Here we exploit the first detailed record of radiocarbon levels across the Laschamps Excursion using New Zealand swamp kauri (<em>Agathis australis</em>) trees to precisely align Pacific Basin environmental changes with polar paleoclimate records (via <sup>10</sup>Be). Comprehensive radiocarbon-dated and glacial sequences are consistent with global chemistry climate modelling, and show synchronous climate changes across the mid to low latitudes that are concentrated during the geomagnetic field minima (42.2-41.5 ka) in the transitional phase that precedes the Laschamps Excursion. Critically, the revised timing reveals associations with a wide range of extinction events and major changes in the global archaeological record, which we hereby term the Adams Event. The climatic, environmental, and evolutionary impacts of past magnetic reversals now form a critical issue for future investigation.</strong></p>

scholarly journals Montane Meadows as a Microcosm for Predicting Global Change

2005 ◽  
Vol 29 ◽  
pp. 70-73
Author(s):  
D. Debinski
Keyword(s):  
Environmental Changes ◽  
Global Climate ◽  
Warning System ◽  
Distribution Patterns ◽  
Atmospheric Composition ◽  
Ecological Changes ◽  
Climate Shifts ◽  
Terrestrial Habitats ◽  
Montane Meadows ◽  
Changes Over Time

The last decade has witnessed intensifying, abrupt global climate change. Despite this impact, we know little about when, what, and how changes occur. Most climate research is limited to studies of the abiotic environment, focusing on atmospheric composition and carbon fluxes. These studies fail to provide adequate indicators of climate changes and their impact on habitats and species. Recent and intensifying ecological changes have generated interest in (Root et al. 2003, Thomas et al. 2004), and the need for tools that can help to prepare for global climate shifts. Changes in ecological (biotic) communities are excellent indicators of climate shifts, providing models to predict changes over time. Montane meadows, defined here as persistently non­forested habitats in mountain ecosystems, make up a small percentage of terrestrial habitats, but they are likely to exhibit changes much more rapidly than most other areas. These meadows are arrayed along a hydrological gradient (from hydric to mesic to xeric) and inhabited by short-lived plants and highly mobile animal species that can exhibit quick changes in distribution patterns relative to environmental changes. Thus, they can provide an early warning system for other ecosystems across the globe. Currently, the extent and range of climatic changes that will occur in montane meadows are unknown.

scholarly journals Evolutionary drivers, morphological evolution and diversity dynamics of a surviving mammal clade: cainotherioids at the Eocene–Oligocene transition

2021 ◽  
Vol 288 (1952) ◽  
pp. 20210173
Author(s):  
R. Weppe ◽  
M. J. Orliac ◽  
G. Guinot ◽  
F. L. Condamine
Keyword(s):  
Environmental Changes ◽  
Morphological Evolution ◽  
Late Oligocene ◽  
Early Oligocene ◽  
Global Environmental ◽  
History Of ◽  
Extinction Events ◽  
Fossil Preservation ◽  
Global Environmental Changes ◽  
Diversity Dynamics

The Eocene–Oligocene transition (EOT) represents a period of global environmental changes particularly marked in Europe and coincides with a dramatic biotic turnover. Here, using an exceptional fossil preservation, we document and analyse the diversity dynamics of a mammal clade, Cainotherioidea (Artiodactyla), that survived the EOT and radiated rapidly immediately after. We infer their diversification history from Quercy Konzentrat–Lagerstätte (south-west France) at the species level using Bayesian birth–death models. We show that cainotherioid diversity fluctuated through time, with extinction events at the EOT and in the late Oligocene, and a major speciation burst in the early Oligocene. The latter is in line with our finding that cainotherioids had a high morphological adaptability following environmental changes throughout the EOT, which probably played a key role in the survival and evolutionary success of this clade in the aftermath. Speciation is positively associated with temperature and continental fragmentation in a time-continuous way, while extinction seems to synchronize with environmental change in a punctuated way. Within-clade interactions negatively affected the cainotherioid diversification, while inter-clade competition might explain their final decline during the late Oligocene. Our results provide a detailed dynamic picture of the evolutionary history of a mammal clade in a context of global change.

scholarly journals Climate Change and the Surge for Pandemics

2020 ◽  
Vol 13 (3) ◽  
pp. 138
Author(s):  
Durr e Shehvaar ◽  
Wardah Idris ◽  
Mubashira Ahmed
Keyword(s):  
Climate Change ◽  
Literature Review ◽  
Global Climate ◽  
Research Problem ◽  
Causal Link ◽  
Environmental Crisis ◽  
Nation States ◽  
Global Environmental ◽  
Corporate Goals ◽  
Climate Crisis

The pandemic of the century has caused great concern about the global environmental crisis. The article outlines the various aspects of the surge of pandemic its link to climate change along with the prospects for the nation-states and how they have seen it as a challenge as it is being seen as taking thousands of lives. In the literature review, the research problem that has been tailored is if the pandemic can create a common awareness about the global climate crisis that has destructive projections for the globe itself. A causal link between the surge of pandemics and climate change that helps spread the viruses has been created. In addition to this, we further argue that the nation-states and their exploitative corporate goals that are manipulating the environment should be curbed through decisive steps.

scholarly journals Coastal wetlands can be saved from sea level rise by recreating past tidal regimes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahmood Sadat-Noori ◽  
Caleb Rankin ◽  
Duncan Rayner ◽  
Valentin Heimhuber ◽  
Troy Gaston ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Wetlands ◽  
Environmental Crisis ◽  
Ground Vegetation ◽  
Proof Of Concept ◽  
Tidal Regime ◽  
Vegetation Sampling ◽  
Global Environmental ◽  
Intertidal Ecosystems

AbstractClimate change driven Sea Level Rise (SLR) is creating a major global environmental crisis in coastal ecosystems, however, limited practical solutions are provided to prevent or mitigate the impacts. Here, we propose a novel eco-engineering solution to protect highly valued vegetated intertidal ecosystems. The new ‘Tidal Replicate Method’ involves the creation of a synthetic tidal regime that mimics the desired hydroperiod for intertidal wetlands. This synthetic tidal regime can then be applied via automated tidal control systems, “SmartGates”, at suitable locations. As a proof of concept study, this method was applied at an intertidal wetland with the aim of restabilising saltmarsh vegetation at a location representative of SLR. Results from aerial drone surveys and on-ground vegetation sampling indicated that the Tidal Replicate Method effectively established saltmarsh onsite over a 3-year period of post-restoration, showing the method is able to protect endangered intertidal ecosystems from submersion. If applied globally, this method can protect high value coastal wetlands with similar environmental settings, including over 1,184,000 ha of Ramsar coastal wetlands. This equates to a saving of US$230 billion in ecosystem services per year. This solution can play an important role in the global effort to conserve coastal wetlands under accelerating SLR.

scholarly journals Situating Indigenous Resilience: Climate Change and Tayal’s “Millet Ark” Action in Taiwan

2020 ◽  
Vol 12 (24) ◽  
pp. 10676
Author(s):  
Yih-Ren Lin ◽  
Pagung Tomi ◽  
Hsinya Huang ◽  
Chia-Hua Lin ◽  
Ysanne Chen
Keyword(s):  
Climate Change ◽  
Cultural Diversity ◽  
Indigenous People ◽  
Social Life ◽  
Cultural Practices ◽  
Global Climate ◽  
Collaborative Work ◽  
Biodiversity Loss ◽  
Cultural Knowledge ◽  
Global Environmental

Whereas indigenous people are on the frontlines of global environmental challenges such as climate change, biodiversity loss, and numerous other forms of critical planetary deterioration, the indigenous experiences, responses, and cultural practices have been underestimated in the mainstream frameworks of environmental studies. This paper aims to articulate a meaningful response to recent calls to indigenous and local knowledge on food as a source of resilience in the face of global climate change. By retrieving the values and practices indigenous people of Taiwan, specifically Tayal women, associate with human and non-human ecologies, our collaborative work with the indigenous community explores indigenous resilience and its relevance to indigenous cultural knowledge and global environmental concerns. Pivoting on the “Millet Ark” action, a Tayal conservation initiative of the bio-cultural diversity of millets, this study revolves around issues of how Tayal communities adapt to the climate change, how to reclaim their voice, heritage, knowledge, place, and land through food, and how to narrate indigenous “counter-stories” of resilience and sustainability. The cultural narrative of “Millet Ark” investigates indigenous way of preserving millet bio-cultural diversity and restoring the land and community heritage, inquiring into how Tayal people are adaptive and resilient to change and therefore sustainable through the cultural and social life of millets.

Flood Basalts and Mass Extinctions

2019 ◽  
Vol 47 (1) ◽  
pp. 275-303 ◽  
Author(s):  
Matthew E. Clapham ◽  
Paul R. Renne
Keyword(s):  
Environmental Changes ◽  
Flood Basalt ◽  
Respiratory Physiology ◽  
Mass Extinctions ◽  
Flood Basalts ◽  
Volatile Release ◽  
Ocean Carbon ◽  
Biological Extinction ◽  
Extinction Events ◽  
Environmental Disruption

Flood basalts were Earth's largest volcanic episodes that, along with related intrusions, were often emplaced rapidly and coincided with environmental disruption: oceanic anoxic events, hyperthermals, and mass extinction events. Volatile emissions, both from magmatic degassing and vaporized from surrounding rock, triggered short-term cooling and longer-term warming, ocean acidification, and deoxygenation. The magnitude of biological extinction varied considerably, from small events affecting only select groups to the largest extinction of the Phanerozoic, with less-active organisms and those with less-developed respiratory physiology faring especially poorly. The disparate environmental and biological outcomes of different flood basalt events may at first order be explained by variations in the rate of volatile release modulated by longer trends in ocean carbon cycle buffering and the composition of marine ecosystems. Assessing volatile release, environmental change, and biological extinction at finer temporal resolution should be a top priority to refine ancient hyperthermals as analogs for anthropogenic climate change. ▪ Flood basalts, the largest volcanic events in Earth history, triggered dramatic environmental changes on land and in the oceans. ▪ Rapid volcanic carbon emissions led to ocean warming, acidification, and deoxygenation that often caused widespread animal extinctions. ▪ Animal physiology played a key role in survival during flood basalt extinctions, with reef builders such as corals being especially vulnerable. ▪ The rate and duration of volcanic carbon emission controlled the type of environmental disruption and the severity of biological extinction.

Diatoms in Saline Lakes Paleoclimate and Paleoecology Interpretations

2007 ◽  
Vol 13 ◽  
pp. 149-168 ◽  
Author(s):  
Erik J. Ekdahl
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Global Climate Change ◽  
Water Conservation ◽  
Environmental Changes ◽  
Global Climate ◽  
Light Availability ◽  
Ionic Concentration ◽  
Mitigation Strategies ◽  
Environmental Response

Average global temperatures are predicted to rise over the next century and changes in precipitation, humidity, and drought frequency will likely accompany this global warming. Understanding associated changes in continental precipitation and temperature patterns in response to global change is an important component of long-range environmental planning. For example, agricultural management plans that account for decreased precipitation over time will be less susceptible to the effects of drought through implementation of water conservation techniques.A detailed understanding of environmental response to past climate change is key to understanding environmental changes associated with global climate change. To this end, diatoms are sensitive to a variety of limnologic parameters, including nutrient concentration, light availability, and the ionic concentration and composition of the waters that they live in (e.g. salinity). Diatoms from numerous environments have been used to reconstruct paleosalinity levels, which in turn have been used as a proxy records for regional and local paleoprecipitation. Long-term records of salinity or paleoprecipitation are valuable in reconstructing Quaternary paleoclimate, and are important in terms of developing mitigation strategies for future global climate change. High-resolution paleoclimate records are also important in groundtruthing global climate simulations, especially in regions where the consequences of global warming may be severe.

Sign in / Sign up

Export Citation Format

Share Document