Sentences with phrase «atmospheric carbon now»

Not exact matches

The combustion of fossil fuel now augments the atmospheric carbon dioxide by 0.7 per cent each year.

Growth rates for concentrations of carbon dioxide have been faster in the past 10 years than over any 10 - year period since continuous atmospheric monitoring began in the 1950s, with concentrations now roughly 35 percent above preindustrial levels (which can be determined from air bubbles trapped in ice cores).

About 6000 years ago, levels of atmospheric carbon dioxide rose — and until now slash - and - burn by the 12 million humans on the planet at the time has been blamed.

A crucial reason why the study of freshwater acidification has lagged until now is because determining how atmospheric carbon affects these ecosystems requires complex modeling, and is much less clear than that occurring in oceans, according to study author Linda Weiss, an aquatic ecologist at Ruhr University Bochum in Germany.

But the Southern Ocean plays a more benign role in the global carbon budget: Its waters now take up about 50 % of the atmospheric carbon dioxide emitted by human activities, thanks in large part to the so - called «biological pump.»

«Human influence is so dominant now,» Baker asserts, «that whatever is going to go on in the tropics has much less to do with sea surface temperatures and the earth's orbital parameters and much more to do with deforestation, increasing atmospheric carbon dioxide and global warming.»

New research by University of Delaware oceanographer Wei - Jun Cai and colleagues at Université Libre de Bruxelles, Texas A&M University - Corpus Christi, University of Hawaii at Manoa and ETH Zurich, now reveals that the water over the continental shelves is shouldering a larger portion of the load, taking up more and more of this atmospheric carbon dioxide.

«Now with treaties banning atmospheric testing, carbon - 14 levels are tapering off,» he says.

But there was a very important difference between then and now: the rate of fluctuations in atmospheric carbon dioxide levels in the past appeared in many cases to have been at a snail's pace compared to recent increases - and today's levels continue to go up exponentially - faster and faster and faster.

Now, scientists at Rensselaer are turning these atmospheric assumptions on their heads with findings that prove the conditions on early Earth were simply not conducive to the formation of this type of atmosphere, but rather to an atmosphere dominated by the more oxygen - rich compounds found within our current atmosphere — including water, carbon dioxide, and sulfur dioxide.

Given the atmospheric lifetime of carbon dioxide is many hundreds to thousands of years, we can now understand that long - lived greenhouses will also continue to exert a warming influence on the worlds oceans for a very long time.

But now, new research shows that we may be able to rely - at least in part - on nature alone, which has its own methods for removing atmospheric carbon.

Now, if there's a single take - away from this summary, it would be that the science on the relationship between fossil fuel combustion, rising atmospheric carbon dioxide, and global warming and climate change was really settled by 1979.

and 1998 snippets Methane now contributes about 20 % to the increased direct radiative forcing by greenhouse gases compared to preindustrial times [Shine et al., 1995] Oxidation of CH4 in the troposphere produces carbon monoxide (CO), can lead production of ozone (03), and involves atmospheric oxidant, the hydroxyl radical (OH).

Growing trees that then release their carbon 100 years from now might reduce the size of the transient atmospheric high level, without changing the long climate tail.

[UPDATE, 3/21, 6 p.m.] Jim Hansen and Biographer on Democracy Now It's worth adding that James Hansen discusses climate censorship and his latest draft paper calling for a return to 350 parts per million of atmospheric carbon dioxide on Amy Goodman's Democracy Now radio and Web program.

The G8 vision does not even meet the now - outdated Intergovernmental Panel on Climate Change goal of keeping atmospheric carbon below 450 ppm.

The rates of those exchanges are now being completely overwhelmed by the rate at which we are extracting carbon from the latter set of reservoirs and converting it to atmospheric CO2.

If you accept that carbon dioxide is a greenhouse gas and that human fossil fuel use is now the dominant contributor to atmospheric CO2 changes, then knowing how much global temperatures respond to increased greenhouse gases in the atmosphere is important for understanding the future climate.

For one thing, there is no warming now despite a constant increase of atmospheric carbon dioxide.This is impossible according to the Arrhenius theory of greenhouse warning, but it is an observed fact.

Now that atmospheric CO2 has risen well above its natural level, many aspects of this complex carbon cycle are changing.

The need for countries to make more ambitious emissions - reduction commitments remains self - evident — even more so, now that the world has exceeded 400 ppm of atmospheric carbon dioxide.

Now the record of atmospheric carbon dioxide and methane concentrations has been extended by two more complete glacial cycles to 800,000 years ago.

This is why we have no warming now despite a constant increase of atmospheric carbon dioxide.

Global atmospheric carbon dioxide concentrations have now passed 400 parts per million (ppm), a level that last occurred about 3 million years ago, when both global average temperature and sea level were significantly higher than today.

As it has been presented to the public, the scientific consensus extended precisely to that which... now seems to be in question: the sensitivity of global temperature to increases in atmospheric carbon dioxide.

This is reflected in the relentless increase in atmospheric carbon measured by the Mana Loa laboratory in Hawaii, now above 400 parts per million and rising from the pre-industrial level of below 300 part per million.

«Global atmospheric concentrations of carbon dioxide, methane and nitrous oxide have increased markedly as a result of human activities since 1750 and now far exceed pre-industrial values determined from ice cores spanning many thousands of years.»

Obviously when two oxygen atoms are coupled to a carbon atom it now acts as a pseudo-Tachyon; a carbon atom knows when it is going to be oxidized in the future and it knows the future atmospheric temperature equilibrium point, so while not bound to oxygen suck up heat and then store it and then when burnt, wait a few decades, and release the heat they have been storing up while sitting in coal veins or in oil formations.

There is now widespread agreement among climate scientists that the earth is warming as a result of human activity, primarily due to rising levels of carbon dioxide and other heat trapping atmospheric gases created by burning fossil fuels.

This is the reason why there is no warming now despite a steady increase of atmospheric carbon dioxide.

Now, for no temperature change, one would have a preindustrial equilibrium of 450/1450 (atmospheric carbon over total carbon).

History is repeating itself today, but this time with the stakes raised as atmospheric concentrations of carbon dioxide have now exceeded 400 ppm.

The atmospheric concentration of carbon dioxide has increased by more than 30 % since the start of the industrial age and is higher now than at any time in at least the past 650,000 years.

And using the oceans as a sink causes acidification that scientists now think may cause the most rapid and disruptive change to life in the seas since catastrophic events tens of millions of years ago (see Ocean acidification due to increasing atmospheric carbon dioxide, Royal Society, August 2005 and The other CO2 problem, New Scientist, August 2006).

It is now contributing to atmospheric (carbon dioxide) concentration,» he said.Using a one million sq. km stretch of forest in Manitoba, Gower and his colleagues coupled their measurements of how carbon moved between the atmosphere and the trees with past records and computer models to examine how the forest's ability to store carbon dioxide has changed since mid-century.

Fourier and Pouillet had shown the importance of atmospheric absorption and re-emission of radiation to climate; Tyndall had now, for the first time, identified water vapor and carbon dioxide gas as the most important substances responsible for this effect.

Air bubbles trapped in the ice and chemical clues about atmospheric carbon levels in corals have shown that there is now more carbon dioxide in the air than at any other point in the history of human civilization.

But now, to make sense of the precise link between greenhouse gases and climate change, researchers must first understand in much greater detail how the oceans and the land absorb atmospheric carbon, and in what quantities.

And is there any way to work out what the temperature would be if the atmospheric pressure was half or double what it is now, but with the same amount of carbon dioxide?

Remarkably, the report included a 23 - page discussion of the climatic effects of increased concentrations of atmospheric carbon dioxide (CO2), due to the combustion of fossil fuels, and — interestingly enough — concluded with a proposal for research on a specific approach to responding, namely with what is now called «geoengineering.»