Sentences with phrase «on geological time»

My real point was that the CO2 levels in geological time scales are not really comparable to current human emissions - because on geological time scales there is a removal process.

So it's no secret that on geological time scales the climate has been vastly different.

And so Earth scientists are now writing of human impact on a geological time scale.

Clearly even with no carbon, coal is not renewable — except on geological time frames.

Now, you might argue that biodiversity will eventually recover after a serious culling but that would occur on geological time scales and wouldnt do us much good.

Soil that was formed on a geological time scale is being lost on a human time scale.

Nevertheless, independent correlations between GCR flux variations and climate (on the time scale of days — Forbush events, and on geological time scales — due to galactic variations) do appear to exist.

The present sea level rise now observed is very small relative to sea level changes on geological time scales.

The difference of more than two orders of magnitudes between sea level change on a human time scale and sea level change on a geological time scale is the result of several mechanisms affect sea level at different amplitudes and over different time periods.

Because I recognize the true degree of our ignorance in addressing this supremely difficult problem, while at the same time as a mere citizen I weigh civilization and its benefits against draconian energy austerity on the basis of no actual evidence that global climate is in any way behaving unusually on a geological time scale.

It doesn't matter whether it is Antarctic polar ice, or tropical ice from Mt Kilimajaro, it will go down hill locally, and the zero datum is the same everywhere due to the earth not being a rigid body, on geological time scales.

My understanding is if we get to a 3C increase, that will more or less guarantee we will eventually (on a geological time scale) reach 6C (due to these other «slow» feedbacks mentioned in this discussion), and the possibility of really, really bad things happening.

So, what I would propose, since «runaway» is a useful term, indicating a positive feedback scenario more succinctly, is to distinguish between «permanent runaway» and «temporary or limited runaway» GW (temporary on the geological time scheme of thousands or millions of years).

The overall result of the phenomena involved in this process is, that the amount of carbon available in the biosphere is steadily diminishing and, on a geological time scale, it is certain that without human intervention it would eventually lead to critical shortage of carbon available for life on Earth.

Due to the irreversible physical and chemical processes converting biomass to fossils the amount of carbon available in the biosphere is steadily diminishing and, on a geological time scale, it is certain that without human intervention it would eventually lead to critical shortage of carbon available for life on Earth.

Brief PowerPoint presentation on geological time to be used alongside the Geog.1 text book for Year 7 pupils (although, it could be adapted for a Science lesson on evolution).

So, what I would propose, since «runaway» is a useful term, indicating a positive feedback scenario more succinctly, is to distinguish between «permanent runaway» and «temporary or limited runaway» GW (temporary on the geological time scheme of thousands or millions of years).

Most major animal groups appear for the first time in the fossil record some 545 million years ago on the geological time scale in a relatively short period of time known as the Cambrian explosion.

And what we see is both how complex climate changes can be and how profound an effect changing patterns of ocean circulation can have on global climate states, if looked at on a geological time scale.»

«We're good at placing these forecasts and probabilistic terms on a geological time scale, but we're not good at putting it at scales that matter to you and me.»

It is one of the heaviest - known elements, yet it does not occur naturally because all of its isotopes are radioactive and decay rapidly on a geological time scale,» said the study's lead author, François Tissot, UChicago PhD» 15, now a W.O. Crosby Postdoctoral Fellow at the Massachusetts Institute of Technology.

Using the naturally occurring uranium - lead isotope decay system, which is used for age determinations on geological time - scales, the authors deduced that these events took place at least 3.02 billion years ago.

For over twenty years, the dominant opinion in research was that this «mother of all disasters» happened abruptly and without warning, when seen on a geological time - scale — estimates suggest a period of just 60,000 years.

Not exact matches

If we compare it with biological evolution on different Geological Time Scale first developed life was also in the form of fish which originated during Cambrian period.

And on and on — according to many experts, the extinction spasm caused by climate change and other environmental degradation in this century will equal or surpass those caused by crashing asteroids in geological times.

Scarcely any of the billions of living individuals have ever left their trace in an existing fossil, since the deposit of such a preserved fossil relies on very specific climatic / geological conditions to have occurred at the time of the organism's death.

So much so that one could draw a steadily rising Curve of Life taking Time as one co-ordinate and, as the other, the quantity (and quality) of nervous tissue existing on earth at each geological stage.

The thick covering of ice and water might mess up some of the geological processes that, at least on Earth, help regulate the planet's temperature over long periods of time.

«The extent of fault creep, and therefore locking, controls the size and timing of large earthquakes on the Northern San Andreas Fault system,» said James Lienkaemper, a co-author of the study and research geophysicist at U.S. Geological Survey (USGS).

Dr Oliver Kuras, from the British Geological Survey, who led on the development of geo - electrical imaging technology, said: «It is traditionally difficult to reliably «see inside rock walls» using conventional electrical imaging methods, particularly when repeating surveys over time.

Consider any moment of the geological record of life on Earth: to what extent were the changes of the next 10 or 100 million years predictable at that time?

It's appropriate that one of these ancient, weathered lands — which provide such a clear window on Earth's geological past — will be chosen to look billions of years back in time.

A team including researchers from the U.S. Geological Survey (USGS) and the San Diego Zoo Institute for Conservation Research has developed a novel methodology that, for the first time, combines 3 - D and advanced range estimator technologies to provide highly detailed data on the range and movements of terrestrial, aquatic, and avian wildlife species.

«The ability to routinely monitor calving events is a new approach,» said Bruce Molnia, research geologist with the U.S. Geological Survey, who has written extensively on Alaska's glaciers and has documented their change over time.

«The good thing about this study,» Uskins Peate says, «is it's applicable to any time in Mars's history where you've had wind - blown material being deposited, which could be anywhere from the very first geological processes that were happening early on in Mars's history up until yesterday.

By the time the mission is completed, scientists hope to get answers on why Mercury is so dense and understand its geological history, the structure of its iron - rich core and other issues.

This new technology has been applied for the first time to rocks and will yield new insights about our streams on Earth in the geological past.

On 23 April, the U.S. Geological Survey (USGS) released a report that, for the first time, accounts for these human - caused, or induced, earthquakes in a map of seismic hazards across the country.

As a result of atmospheric patterns that both warmed the air and reduced cloud cover as well as increased residual heat in newly exposed ocean waters, such melting helped open the fabled Northwest Passage for the first time [see photo] this summer and presaged tough times for polar bears and other Arctic animals that rely on sea ice to survive, according to the U.S. Geological Survey.

Despite the possible benefits, junior researchers may feel that they shouldn't be spending precious time on anything that takes them away from their science, says Britta Voss, a postdoc at the U.S. Geological Survey in Boulder, Colorado, who studies carbon in river systems.

The geological search for ancient life frequently zeroes in on fossilized organic structures or biominerals that can serve as «biosignatures,» that survive in the rock record over extremely long time scales.

«You've got bears that are spending increasing amounts of time on land becoming nutritionally stressed, moving into areas of human settlements,» says Todd Atwood, a wildlife biologist at the US Geological Survey.

Measuring geological time: Two pyroclastic vents on the floor of Mercury's Kipling crater, top, would likely not have survived the impact; they are more recent.

The Silurians supposedly evolved on Earth during the eponymous era, a geological time period lasting from 443 million to 416 million years ago.

On geological (as opposed to historical) time scales the carbon inventory includes a great deal of mass that is in the earth's interior.

We are witnessing a time when the human impact on the earth system is growing exponentially, spawning the proposed naming of a new geological era, where the earth system is under the influence of the human race: the Anthropocene, of «the Age of Man» (and Woman).

The international working group, which includes geologists Jan Zalasiewicz, Mark Williams and Colin Waters, from the University of Leicester's School of Geography, Geology and the Environment and archaeologist Matt Edgeworth has, since 2009, been analysing the case for formalisation of the Anthropocene, a potential new epoch of geological time dominated by overwhelming human impact on the Earth.

Professor Colin Waters, who led the study, said: «Of the 65 «golden spikes» of the Geological Time Scale currently ratified, all but one are located in strata that accumulated on the sea floor, the one exception being the ice core used to define the base of the Holocene Epoch.

Once this detailed work is completed in a few years» time — a required part of the process in seeking formalisation of the term by a number of geological bodies — it will first be submitted for scrutiny to the Subcommission on Quaternary Stratigraphy of the International Commission on Stratigraphy.

This is a reference level within recent strata somewhere in the world that will be proposed to most clearly and consistently characterise the changes as the Holocene, which represents the last 11,700 years of geological time on this planet, gave way into the Anthropocene about 65 years ago.