Sentences with phrase «earth history co2»

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

Not exact matches

About fifty million years ago, a brief moment in the long history of life on earth, geological evidence indicates, CO2 levels were several thousand ppm, much higher than now.

This research, which can be read in Scientific Reports, completely calls into question the scientific theories regarding these phenomena, founded on the increase of CO2 in the atmosphere, and paves the way for a new vision of Earth's climate history.

This further evidence of episodic emissions of volcanic CO2 as the likely driver of the extinction enhances our understanding of this event, and potentially of other climate change episodes in Earth's history.»

In May 2013, the CO2 concentration in Earth's atmosphere surpassed a milestone of 400 ppm for the first time in human history, a level that many scientists consider dangerous territory in terms of its impact on Earth's climate.

The resulting graph of CO2 levels and temperature over Earth's history was remarkable.

By studying the relationship between CO2 levels and climate change during a warmer period in Earth's history, the scientists have been able to estimate how the climate will respond to increasing levels of carbon dioxide, a parameter known as «climate sensitivity».

Decoding Earth's CO2 history It is quite difficult to reconstruct temperatures 3 million years ago, of course.

The new evidence has the potential to alter perceptions about which planets in the universe could sustain life and may mean that humans are having an even greater impact on levels of CO2 in Earth's atmosphere than accepted evidence from climate history studies of ice cores suggests.

Other theories have suggested that geological forces such as mountain building have, at different times in the planet's history, introduced large amounts of new material to the Earth's surface, and weathering of that material has drawn CO2 out of the atmosphere.

As summarized by geoscientist James Kasting in his 2010 book «How to Find a Habitable Planet»,» [h] abitable zones around Sun - like (F, G, and Early K) stars should be relatively wide because of the natural feedback between atmospheric CO2 [carbon dioxide] levels and climate — the same feedback loop that kept the Earth habitable early its history.

I also recommend watching this video on why CO2 is the biggest climate control knob in Earth's history.

For large parts of the Earth's past history, CO2 - levels have been at least 10 times higher than today, with no apparent catastrophe.

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.

If, in fact, the climate HAS changed over the millions of years of Earth's history (it has), and if, in fact, we are not always able to explain why it has changed (we aren't), then I see no reason to accept the assumption that CO2 has to be the principal driving force.

The close coupling between CO2 and climate led the author to conclude that «geological observations that we now have for the last 20 million years lend strong support to the idea that carbon dioxide is an important agent for driving climate change throughout Earth's history.»

However, when we look back over the Earth's history, we see many periods where CO2 is higher than current levels of 384 ppm.

This claim ignores the fact that CO2 is a natural but very minor constituent of the atmosphere that is indispensable to life on Earth and has been at far higher levels during most of Earth's 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.

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.

If volcanos [or whatever] were emitting 1 trillion tons per year [something we probably should assume has never occurred in the history of earth] it then takes 5100 years this constant level of CO2 emission to make 1 atm of CO2.

After a careful reassessment of climate sensitivity and climate history data, NASA climate science chief James Hansen and his colleagues concluded that the tipping point at which substantial ice - sheets on Earth will disappear is around 450ppm (+ / -100 ppm) of CO2.

The Earth's climate history should tell any real scientist that CO2 has nothing to do with «driving» temperature — if there is a relationship it runs in reverse — temperature (of the ocean surface, in particular) drives CO2 levels.

CO2 has usually been associated with temperature rise throughout the history of the Earth.

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.

Never in recent geological history and during the time in which humans have been on the Earth has the atmospheric CO2 concentration been as high as it is today.

I consider this misleading because there has never been a point in geological history (since the Earth's had an atmosphere, anyway) when CO2 concentrations were 0 ppm.

I. Based on the record of CO2 proxies, Earth's concentration of CO2 has been several times higher in geological history, with no record of any catastrophic results.

For example, the current levels of atmospheric CO2 is at about the lowest level in the geological history of the Earth.

Every one of these EPA, Interior, and other regulatory diktats assumes that CO2 has suddenly replaced the powerful natural forces that have driven climate fluctuations throughout Earth's history — and ignores this miracle molecule's role in making crops, forests, and grasslands grow faster and better while using less water.

The evidence being that CO2 levels are rising at a rate that is possibly unprecedented in Earth's history coupled with the strong impacts CO2 has on several Earth systems (the greenhouse effect and surface ocean pH being just two).

More relevantly though man is increasing CO2 at a rate unprecedented in earth's history — as far as we know and CO2 has significant impact on radiative transfer in the atmosphere and pH in the surface ocean.

This snowpack accumulation near the poles, which gets its water via the Arctic and Antarctic oceans, that in turn rob it from equatorial latitudes of our oceans, also results in a reduction in the earth's spin axis moment of inertia and causes the spin rate to increase as evidenced in the recent history of the rate at which Leap Seconds are added to our calendar (see Wysmuller's Toucan Equation for more on this evidence that during this warm time with much greater polar humidity, earlier seasonal, later seasonal and heavier snows are beginning to move water vapor from the oceans to the poles to re-build the polar ice caps and lead us into a global cooling, while man - made CO2 continues to increase http://www.colderside.com/faq.htm).

However, over long time periods, the variation of the global average temperature with CO2 concentration depends on various factors such as the placement of the continents on Earth, the functionality of ocean currents, the past history of the climate, the orientation of the Earth's orbit relative to the Sun, the luminosity of the Sun, the presence of aerosols in the atmosphere, volcanic action, land clearing, biological evolution, etc..

Global atmospheric temperatures as well as atmospheric CO2 have been gradually and erratically falling for significant portions of Earth's history, but not in unison.

In the real world, «all other things» are most definitely NOT «held equal,» the feedbacks are offsetting / negative feedbacks (which can be seen from the Earth's climate history, which does NOT show any effect of CO2 levels on temperature), and the «real world» effect is essentially nil.

Today's atmospheric 400 ppm (parts per million) CO2 levels are actually very low compared with the 2,000 ppm that existed during periods when life flourished throughout much of Earth's history.

The Earth's history tells us that even if we put back all the CO2 in the air that the plants have removed and saved as coal, peat and perhaps some as oil, we can not overcome these natural events.

For most of the earth's history past the Cambrian explosion 500mya when life began to take up residence on land there have been no ice caps at all and far higher CO2 levels.

Only by thoroughly examining climate history can we estimate natural contributions and evaluate earth's sensitivity to rising CO2.

Thus, I answered Adam's question by trying to walk through the history of climate science starting with Joseph Fourier in 1824 discovering the greenhouse effect, John Tyndall in 1859 discovering H2O and CO2 absorb infrared which confirmed Fourier's greenhouse effect and Svante Arrhenius proposing in 1896 that human CO2 emissions would prevent earth from entering next ice age.

«Throughout most of earth's history, CO2 levels have been significantly higher than they are now, and life flourished.

They also include models for things like: entry into and exit from Ice Ages, the effect of the Earth's orbit on climate, the earth's climate history on scales of thousands to millions of years, ocean - atmosphere couplings (e.g. heat transfer, CO2 sinks), decadal phenomena such as ENSO and theEarth's orbit on climate, the earth's climate history on scales of thousands to millions of years, ocean - atmosphere couplings (e.g. heat transfer, CO2 sinks), decadal phenomena such as ENSO and theearth's climate history on scales of thousands to millions of years, ocean - atmosphere couplings (e.g. heat transfer, CO2 sinks), decadal phenomena such as ENSO and the PDO.

33) Today's CO2 concentration of around 385 ppm is very low compared to most of the earth's history — we actually live in a carbon - deficient atmosphere

Our best inference from various proxies back indicate that CO2 was higher for the first 4 billion years of Earth's history than it has been since the Cambrian Period until today.

In short CO2 is completly innocent in Earths entire history.

During the last glaciation, which peaked 18,000 years ago, CO2 bottomed out at 180 ppm, extremely likely the lowest level CO2 has been in the history of the Earth.

There is no known rate of CO2 rise faster than that in Earth's history.

Which is also not based on any good science, and in the face of Earth climate history with CO2 level changes in the range of «less than 200ppm» to «7,000 ppm» is a ridiculous claim.

Thus, our approach is to examine Earth system sensitivity to CO2 change by calculating the CO2 history required to produce our reconstructed Cenozoic temperature history for alternative state - independent and state - dependent climate sensitivities.