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165
نتائج ل
"Human beings Extinction."
صنف حسب:
Linking the influence and dependence of people on biodiversity across scales
Biodiversity enhances many of nature's benefits to people, including the regulation of climate and the production of wood in forests, livestock forage in grasslands and fish in aquatic ecosystems. Yet people are now driving the sixth mass extinction event in Earth's history. Human dependence and influence on biodiversity have mainly been studied separately and at contrasting scales of space and time, but new multiscale knowledge is beginning to link these relationships. Biodiversity loss substantially diminishes several ecosystem services by altering ecosystem functioning and stability, especially at the large temporal and spatial scales that are most relevant for policy and conservation.
Journal Article
Has the Earth's sixth mass extinction already arrived?
Palaeontologists characterize mass extinctions as times when the Earth loses more than three-quarters of its species in a geologically short interval, as has happened only five times in the past 540 million years or so. Biologists now suggest that a sixth mass extinction may be under way, given the known species losses over the past few centuries and millennia. Here we review how differences between fossil and modern data and the addition of recently available palaeontological information influence our understanding of the current extinction crisis. Our results confirm that current extinction rates are higher than would be expected from the fossil record, highlighting the need for effective conservation measures.
Journal Article
The Invention of Ecocide
As the public increasingly questioned the war in Vietnam, a group of American scientists deeply concerned about the use of Agent Orange and other herbicides started a movement to ban what they called \"ecocide.\"
David Zierler traces this movement, starting in the 1940s, when weed killer was developed in agricultural circles and theories of counterinsurgency were studied by the military. These two trajectories converged in 1961 with Operation Ranch Hand, the joint U.S.-South Vietnamese mission to use herbicidal warfare as a means to defoliate large areas of enemy territory.
Driven by the idea that humans were altering the world's ecology for the worse, a group of scientists relentlessly challenged Pentagon assurances of safety, citing possible long-term environmental and health effects. It wasn't until 1970 that the scientists gained access to sprayed zones confirming that a major ecological disaster had occurred. Their findings convinced the U.S. government to renounce first use of herbicides in future wars and, Zierler argues, fundamentally reoriented thinking about warfare and environmental security in the next forty years.
Incorporating in-depth interviews, unique archival collections, and recently declassified national security documents, Zierler examines the movement to ban ecocide as it played out amid the rise of a global environmental consciousness and growing disillusionment with the containment policies of the cold war era.
eBook
Save the people! : halting human extinction
\"A book for middle-school-aged children about previous extinctions and possible threats to humans, from volcanoes, to asteroids, to pollution and diseases\"-- Provided by publisher.
Book
Human occupation of northern Australia by 65,000 years ago
The time of arrival of people in Australia is an unresolved question. It is relevant to debates about when modern humans first dispersed out of Africa and when their descendants incorporated genetic material from Neanderthals, Denisovans and possibly other hominins. Humans have also been implicated in the extinction of Australia's megafauna. Here we report the results of new excavations conducted at Madjedbebe, a rock shelter in northern Australia. Artefacts in primary depositional context are concentrated in three dense bands, with the stratigraphic integrity of the deposit demonstrated by artefact refits and by optical dating and other analyses of the sediments. Human occupation began around 65,000 years ago, with a distinctive stone tool assemblage including grinding stones, ground ochres, reflective additives and ground-edge hatchet heads. This evidence sets a new minimum age for the arrival of humans in Australia, the dispersal of modern humans out of Africa, and the subsequent interactions of modern humans with Neanderthals and Denisovans.
Journal Article
Accelerated increase in plant species richness on mountain summits is linked to warming
Globally accelerating trends in societal development and human environmental impacts since the mid-twentieth century
are known as the Great Acceleration and have been discussed as a key indicator of the onset of the Anthropocene epoch
. While reports on ecological responses (for example, changes in species range or local extinctions) to the Great Acceleration are multiplying
, it is unknown whether such biotic responses are undergoing a similar acceleration over time. This knowledge gap stems from the limited availability of time series data on biodiversity changes across large temporal and geographical extents. Here we use a dataset of repeated plant surveys from 302 mountain summits across Europe, spanning 145 years of observation, to assess the temporal trajectory of mountain biodiversity changes as a globally coherent imprint of the Anthropocene. We find a continent-wide acceleration in the rate of increase in plant species richness, with five times as much species enrichment between 2007 and 2016 as fifty years ago, between 1957 and 1966. This acceleration is strikingly synchronized with accelerated global warming and is not linked to alternative global change drivers. The accelerating increases in species richness on mountain summits across this broad spatial extent demonstrate that acceleration in climate-induced biotic change is occurring even in remote places on Earth, with potentially far-ranging consequences not only for biodiversity, but also for ecosystem functioning and services.
Journal Article