Sentences with phrase «earth history 10ka»

Independently of the period of Earth history one chooses to look at last (thousand years, last ten thousand, last one million, it fluctuates, but within bounds.

The two most prominent warm phases in Earth history occurred during the Mesozoic and early Cenozoic eras (approximately 250 million to 35 million years ago) and the early and mid-Paleozoic (approximately 500 million to 350 million years ago).

Broad's article deals with the implications of research on climate change over the broad sweep of the Phanerozoic — the past half billion years of Earth history during which fossil animals and plants are found.

«We are realising that the Anthropocene is a phenomenon on a massive scale — it is the transformation of our planet by human impact, in ways that have no precedent in the 4.54 billion years of Earth history.

The response to # 41 reminds me of people who point out that in the ancient Earth history one can find co2 far higher than 400ppm, far higher than 500ppm etc..

My first reaction in 1979 to the K - T asteroid impact event was the same as that of most paleontologists — disbelief and denial that such a thing could ever happen so late in Earth history.

In common with many such crises throughout Earth history, there is direct evidence from the rock and fossil records for elevated atmospheric CO2, rising temperatures, increased weathering and run - off, sealevel rise, expanded oceanic anoxia as well as other warming - related environmental changes.

You see for most of earth history CO2 has been high.

Regarding the argument «Climate changes are common in Earth history».

Through the Integrated Early Jurassic Timescale and Earth System project (JET), a multi-faceted, international programme of research on the functioning of the Earth system, new data from the old Mochras core will be combined with data from a new core to provide an understanding of global change and quantify the roles of tectonic, palaeoceanographic, and astronomical forcing on hyperthermal (and hypothermal) events at this key juncture in Earth history.

... the global warming event is not unprecedented in Earth history.

His research interests are broadly in the area of Earth history and are aimed at understanding the dynamics of past perturbations in the Earth's physical and biological systems and their expression in the sedimentary record.

In 2013, he returned to Oxford where much of his current research aims to document and understand past climate variability, particularly during exceptionally warm intervals of Earth history, such as the Cretaceous.

2006, the year when we connected positive feedback loops to abprupt climate change / as happend a few times in earth history.

Efforts to model sea - level changes in Earth history tend to show an underestimation of past sea - level changes.

«The Arctic system is moving toward a new state that falls outside the envelope of glacial - interglacial fluctuations that prevailed during recent Earth history.

In this way, the Anthropocene no longer represents a rupture in Earth history but is a continuation of the kind of impact people have always had.

My PhD research focussed on the Neoproterozoic, a period in Earth history when some researchers believe glaciation was global, covering continents and oceans.

What does it mean to have arrived at this point, where human history and Earth history collide?

Paul Hoffman has profoundly changed our understanding of earth history by integrating and synthesizing geological observations, tectonics, geochemistry, and climate science.

Once at odds, a climate expert and botanist who studies ancient plants later teamed up to improve understanding of one of the warmest periods in Earth history.

We describe the discipline of climate change science, and individual climate scientists whose expertise spans Earth history, geology, geography, biology, oceanography, astronomy, mathematics, physics, chemistry, engineering and more.

Extreme events of ocean oxygen depletion leading to anoxia are thought to be prime candidates for explaining some of the large extinction events in Earth history including the largest such event at the end of the Permian 250 million years ago.

Recent Earth history has featured quasi -100,000-y, glacial − interglacial climate cycles with lower / higher temperatures and greenhouse gas concentrations during glacials / interglacials.

The last time in Earth history when the global average surface temperature was as warm as the IPCC projects for 2100 in its mid-range scenarios, there was very little polar ice and sea level would have been roughly 70 meters (over 200 feet) higher than at present.

«But most people think we had this much earlier in Earth history.»

The last 200,000 years of earth history has been an iceage.

I kind of suspect that is true because you said «The last 200,000 years of earth history has been an iceage» with such certainty.

A research team known as the Anthropocene Working Group now believes that humans have already changed the course of Earth history.

What kind of being made these laws and ethical codes, and what kind of being changed the course of Earth history?

All you skeptics should take a class in earth history and environmental science.

«This research shows that we've experienced almost the same range of temperature change since the beginning of the industrial revolution,» says Major, «as over the previous 11,000 years of Earth history — but this change happened a lot more quickly.»

If you want to understand climate, go out and map several square miles of the crust, log ten miles of core, then figure out a hundred million years of earth history 10Ka at a time.

So far - reaching is the impact of modern humans that esteemed palaeoclimatologist Wally Broecker has suggested that we have not entered a new geological epoch, a relatively minor event on the geologic time scale, but a new era — the Anthropozoic — on a par in Earth history with the development of multicellular life.

They claim the link between climate change and raising animals for meat is borne out by Earth history.

Reason assuming one is aware that CO2 levels in Earth history has been much higher than today's levels, would inform you that there can not be a runaway effect due to CO2.

Researchers believe such dramatic changes in the carbon dioxide system in surface waters have not been observed for more than 20 million years of Earth history.

Geologists study Earth history: Today we are concerned about climate change.

The decisive truth to recognise is that in the last two centuries, and more likely the last several decades, there has been a break or rupture in both Earth history and human history, one that demands a wholesale rethinking of the modernist concepts and categories that most of us take for granted.

The geological evidence is that life (in general) is fairly robust wrt atmospheric CO2 levels, and indeed that from a geological perspective we are close to the bottom end of the range of both CO2 and temperature ranges experienced in Earth history.

I am disputing, based on reading credible scientists and looking at Earth history, the idea that CO2 is an agent of doom at current or realistically attainable levels in the future.

John, Ove also came out with the 150 year timeframe at the Brisbane meeting, which to those of us in the audience with a true geological background was just another example of the lack of understanding of a marine biologist for real earth history as you rightly point out.

Siberian Flood Basalts — MIT: About 252 million years ago, the largest mass extinction and the largest volcanic eruptions in Earth history occurred apparently synchronously.

Temporally, it requires that we imagine ourselves inhabitants not just of a human lifetime or generation, but also of «deep time» — the dizzyingly profound eras of Earth history that extend both behind and ahead of the present.

This research shows that we've experienced almost the same range of temperature change since the beginning of the industrial revolution as over the previous 11,000 years of Earth history — but this change happened a lot more quickly.

And capitalist - technocratic, because the dominant narrative of the Anthropocene has technology as its driver: recent Earth history reduced to a succession of inventions (fire, the combustion engine, the synthesis of plastic, nuclear weaponry).

In Earth history, net soil carbon has accumulated at comparatively small quantities per year, which is why annual CO2 levels haven't been constantly plummeting over the course of Earth's history.

The rate of change is not only unprecedented, it is unprecedented in the earth history.

Paul Crutzen, the Nobel laureate in chemistry who, with others, proposed the term in 2000, and Christian Schwägerl, the author of «The Age of Man» (German), described the value of this new framing for current Earth history in January in Yale Environment 360:

This is the proposed epoch of Earth history that, proponents say, has begun with the rise of the human species as a globally potent biogeophysical force, capable of leaving a durable imprint in the geological record.