Sentences with phrase «major extinctions»

With it, frogs survived several major extinction events, and there are now over 4,000 modern species.

As humans release ever - larger amounts of carbon dioxide into the atmosphere, besides warming the planet, the gas is also turning the world's oceans more acidic — at rates thought to far exceed those seen during past major extinctions of life.

A study published in Science in March 2012 found that ocean acidity may be increasing faster today than it has during four major extinctions in the last 300 million years.

Short, rapid warming events, known as interstadials, coincided with major extinction events, according to a team of scientists from Australia and the United...

Another criticism is that although there have been periods of extremely rapid regional warming at the end of recent ice ages, they don't appear to have been marked by major extinctions, although this could be because the fossil record is incomplete or poorly studied.

The impact of a comet could have devastating effects on life here, perhaps causing major extinctions.

Gases spewed by similar volcanic outpourings have been linked to other major extinction events.

«Toxic ocean conditions during major extinction 93.9 million years ago quantified: Doesn't take much sulfide to impact ocean life.»

The new research «suggests that any future major extinctions of fishes could result in a long - term decrease in survivor's body sizes,» says John Long, a paleontologist at Flinders University in Adelaide, Australia.

While researchers have derived a number of calculations about the intensity of this crisis — speculating it is likely to surpass earlier major extinction events in terms of both the number of extinctions and the rate at which species will disappear — major questions remain.

Beyond these academic questions, there are also more practical issues related to the possible commercial exploitation of resources from asteroids and comets, and to potential approaches towards protecting the Earth from major extinction - level impact events in the future.

As a species, we are racing toward the next major extinction event; five have occurred throughout the course of our planet's history, and some say the sixth event is already underway.

An asteroid five miles wide would cause major extinctions, like the one that may have marked the end of the age of dinosaurs.

Scientists have long debated the causes of this event and Earth's four other major extinctions, usually pointing to various volcanoes or asteroids.

Going hand - in - hand with this climate change in the geological past have been lots of extinctions as well, including at least five major extinction events which each saw the range of life on the planet change drastically.

«It was something like the world after a major extinction event,» says Rainey.

Every major extinction coincides with one of these eruptions.

It is perhaps no accident that the timing of this occupation coincides with a major extinction of larger ice age mammals such as the woolly mammoth and woolly rhinoceros.

«Without a dramatic shift in the business - as - usual course for marine management,» Payne and his team write, «our analysis suggests that the oceans will endure a mass extinction of sufficient intensity and ecological selectivity to rank among the major extinctions of the past 500 million years.»

The classic story is that all modern mammal groups started to develop no more than 65 million years ago, after the end of the Cretaceous Period, when a probable meteorite impact led to a major extinction in which all the dinosaurs died.

«Why should every major extinction have the same cause?»

A major extinction thought to occur shortly after the dawn of complex animals may not have happened at all.

Life on Earth has survived at least five major extinction events, but it is the dinosaurs» mass die - off that most captures our imagination.

Instead, they became victors by accident, expanding into niches left vacant by a major extinction event at the end of the Triassic.

Obviously exceptional survivors, these animals predate the advent of modern fish and have survived at least four major extinction events.

Regarding the possible role hydrogen sulfide in the major extinctions you might want to check out another book, one which places it in the context of the methane clathrate gun, the destruction of the coccolithophores which help to maintain an oxygenated atmosphere by ocean acidification, the role of algae blooms, etc...

It seems likely that ozone depletion contributed to the major extinctions that took place during these warm global periods.

Even in the end Cretaceous extinction, in which dinosaurs were finally wiped out by an asteroid impact, a major global - warming extinction event was already underway causing a major extinction within 150,000 years of the impact.

However, foraminifera that lived on the sea floor (benthic forms) suffered a major extinction event, with 30 — 50 % of species going extinct during the PETM.

Ar39Ar dating of the Siberian Traps, USSR Evaluation of the ages of the two major extinction events relative to episodes of flood - basalt volcanism in the.

Could a slight change in temperature actually be responsible for such a major extinction.

Marine life is under severe threat from global warming, pollution and habitat loss, with a high risk of «major extinctions» according to a panel of experts.

The analysis, published in the journal Science, is the first comprehensive analysis of the areas and states: «Major extinction events in Earth's history have been associated with warm climates and oxygen - deficient oceans.»

The 5 year and older ice was only meant to go by 2022, so the Earth is running ahead of schedule with its major extinction event by at least 5 years.

From what I understand, four out of five of the major extinctions may have involved this mechanism, and at least once the process may have begun shortly after 1000 ppm.