Mass Extinction: Life at the Brink tells that story. The hour-long documentary, airing on the Smithsonian Channel, explores the causes of two of Earth's five mass extinctions: the dinosaurs' demise and the "Great Dying." That long-ago extinction, roughly 252 million years ago, saw as many...
The problem with this graph is that before 500 years ago, extinction rates are approximated from studying fossils, which is a notoriously unreliable method of measuring extinction rates. As explained in the textbookBiodiversity and Environmental Philosophy, the “benchmark for assessing the severity of...
Humans have already wiped out hundreds of species and pushed many more to the brink of extinction through wildlife trade, pollution, habitat loss and the use of toxic substances. But the findings published in the scientific journalProceedings of the National Academy of Sciences(PNAS) show that the...
A new study in PNAS highlights the mass extinction we are currently undergoing and how losing species would devastate entire ecosystems and upend human life as well. The researchers emphasize the need for immediate action that includes designating any species with populations less than 5,000 as “...
Some of the really hard conversations around climate change in the future are going to be with communities who will need to relocate or will lose their way of life because of climate impacts. These discussions are both really important and really difficult – we should be planning for that. ...
With the steep decline in populations of many animal species, from frogs and fish to tigers, some scientists have warned that Earth is on the brink of a mass extinction like those that occurred only five times before during the past 540 million years. Ea
A mass extinction is an event in which at least 25-75% of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. Five mass extinctions have occurred throughout time, two of th...
Changhsingian magnetic polarity timescale compiled from integrated stratigraphy at Shangsi.High-resolution polarity and δ13C enable global correlations of the Permian-Triassic interval.The polarity chron (LT1n) is after mass extinction and prior to the Permian-Triassic boundary.关键词: Latest Permian...
Dinasour extinction and volcanic activity There is at present some controversy about the reason for the mass extinction of dinosaurs and other forms of life at the end of the Cretaceous. A suggesti... J.,A.,Gledhill - 《Eos Transactions American Geophysical Union》 被引量: 8发表: 1985年 加...
Here we compare the patterns of diversity and disparity in the Therocephalia, a diverse lineage of amniotes that survived two mass extinction events. We use time calibrated phylogeny and discrete character data to assess macroevolutionary patterns. The two are coupled through the early history of ...