Sentences with phrase «atmospheric carbon dioxide concentrations»

And that event of climate change led to ocean surface warming, sea level rise, and increases in atmospheric carbon dioxide concentrations as changing ocean circulation delivered gases to the atmosphere.

The 800,000 year history of atmospheric carbon dioxide concentrations, showing the huge spike in the past century.

Clearly we want to reduce atmospheric carbon dioxide concentration, once we have that ability, the final equilibrium number is pretty much meaningless, call it anything around 300 ppm or so.

This paper has multiple issues — mostly to do with dubious correlations with atmospheric carbon dioxide concentration — but it has considerable strengths, too.

Then atmospheric carbon dioxide concentrations began to rise, which helped the climate to warm a bit faster and somewhat further.

Leading climate scientists say atmospheric carbon dioxide concentrations should be reduced to 350 parts per million to avoid catastrophic, irreversible impacts.

The chart below shows what happens to total atmospheric carbon dioxide concentrations if these scenarios were played out over the centuries ahead.

Since the onset of the industrial revolution, the burning of fossil fuels has been the primary force behind the observed 40 % increase in atmospheric carbon dioxide concentrations.

Here we present results of the lowest 200 m of the Dome C ice core, extending the record of atmospheric carbon dioxide concentration by two complete glacial cycles to 800,000 yr before present.

Anomalies in the oceanic carbonate system recorded in marine sediments at the time3, for example while coral reefs were forming, apparently left no signature on atmospheric carbon dioxide concentrations.

Although NAAQS regulation of lead was both technologically and economically feasible, not even a global depression lasting several decades would suffice to lower atmospheric carbon dioxide concentrations below current levels.

This visualization provides a high - resolution, three - dimensional view of global atmospheric carbon dioxide concentrations from September 1, 2014 to August 31, 2015.

As of February, the average atmospheric carbon dioxide concentration in the earth's atmosphere was about 402.6 ppm, according to NOAA data.

Climate change — driven largely by rising atmospheric carbon dioxide concentrations from the burning of coal, oil and gas — is increasing temperatures and cranking up the intensity of extreme weather events globally and in Australia.

Glacier related impacts of doubling atmospheric carbon dioxide concentration on British Columbia and Yukon (Chapter 6).

«It will be no surprise to learn the central point of their essay, ironically titled «Dangerous Assumptions» is «Enormous advances in energy technology will be needed to stabilize atmospheric carbon dioxide concentrations at acceptable levels,» which is otherwise known as the technology trap or the standard «Technology, technology, blah, blah, blah» delayer message developed by Frank Luntz and perfected by Bush / Lomborg / Gingrich.»

We use atmospheric carbon dioxide concentration as a single, simple indicator to track the progression of the Anthropocene.

Receding Himalayan glaciers Almost six years ago, I was the editor of a single - topic issue on energy for Scientific American that included an article by Princeton University's Robert Socolow that set out a well - reasoned plan for how to keep atmospheric carbon dioxide concentrations below a planet - livable threshold of 560 ppm.

«If all those coal plants are built without carbon control, the amount of carbon dioxide added to the atmosphere would make it virtually impossible to stabilize atmospheric carbon dioxide concentrations at a moderate level.»

Among illustrative irreversible impacts that should be expected if atmospheric carbon dioxide concentrations increase from current levels near 385 parts per million by volume (ppmv) to a peak of 450 — 600 ppmv over the coming century are irreversible dry - season rainfall reductions in several regions comparable to those of the «dust bowl» era and inexorable sea level rise.

This would then lead to large, unpredictable changes in ocean ecosystem structure and productivity, on top of other large unpredictable changes to be expected from ocean acidification, the other great oceanic consequence of high atmospheric carbon dioxide concentrations from fossil fuel burning.

If we pin atmospheric carbon dioxide concentration to right about 300 to 320 ppm, we are looking at 20 - 30 thousand years of stable climate, with huge fresh water reserves, and we are only about half way into a global mass extinction.

Soils have the capacity to store significant quantities of carbon, reducing atmospheric carbon dioxide concentrations while also enhancing soil fertility and water retention.

Changes in past atmospheric carbon dioxide concentrations can be determined by measuring the composition of air trapped in ice cores from Antarctica.

On Wednesday, scientists at the University of California in San Diego confirmed that April's monthly average atmospheric carbon dioxide concentration breached 410 parts per million for the first time in our history.

What current atmospheric carbon dioxide concentration tells us about the need to stabilise the global climate and the need for a step change in government, city and business action.

Most importantly, the observations have confirmed that human activities, in particular a 40 % increase in atmospheric carbon dioxide concentrations since the late 19th century, have had a discernible and significant impact on the climate system already.

My work is also directed toward determining why plants exposed to elevated carbon dioxide concentrations often have only a temporary increase in growth rate, and toward determining what plant characteristics might be most beneficial to the productivity and to the nutritional value of crops if atmospheric carbon dioxide concentrations continue to rise.

«If the initial atmospheric carbon dioxide concentration were half its actual value, we would currently be experiencing the climate expected for the year 2050,» says Archer, setting out one possible scenario.

However, this has to a large extent not led to immediate action to address the severity of the imminent crisis of rising global temperatures and associated problems due to the increase in atmospheric carbon dioxide concentrations due to human activity.

Armed with this information, scientists will be able to do a much better job forecasting atmospheric carbon dioxide concentrations in the future, he said, and in understanding the role of human activities on the carbon cycle.

A new NASA study provides space - based evidence that Earth's tropical regions were the cause of the largest annual increases in atmospheric carbon dioxide concentration seen in at least 2,000 years.

Projections out to year 2700 of global atmospheric carbon dioxide concentrations under RCP8.5 with no CDR (black line), CDR5 from 2250 (red), CDR25 from 2250 (orange), CDR5 from 2050 (purple dashed), and CDR25 from 2150 (blue dashed).

Next, in order to convert his emissions forecast into a forecast for warming, he cites an exhibit (Table TS.5, page 66) in an IPCC technical summary that relates atmospheric carbon dioxide concentration to equilibrium temperature change versus pre-industrial temperature, without mentioning the crucial fact that this is an equilibrium projection.

In addition to reporting atmospheric carbon dioxide concentration, the Scripps Institute reports measurements of the concentration of oxygen (O2) in the air.

TTanganyika temperatures follow Northern Hemisphere insolation and indicate that warming in tropical southeast Africa during the last glacial termination began to increase 3000 years before atmospheric carbon dioxide concentrations.

The failure of bristlecone tree ring widths, which were used by Mann et al. as temperature proxies, to reflect the increase in the instrumental temperature record in the period since 1980 when atmospheric carbon dioxide concentration rose more rapidly than at any time since the start of the industrial revolution is, therefore, remarkable.