Sentences with phrase «increasing atmospheric levels»

The study calculated the likely effect of increasing atmospheric levels of greenhouse gases above pre-industrialisation amounts.

As pointed out in the man posting, we don't have a large number of Earths to experiment with, so models are all we have to explore the possible outcomes of e.g. increased atmospheric levels of CO2 or nitrous oxide.

Increased atmospheric levels of CO2 up to several doublings will likely just increasingly rev up the biosphere.

Their papers are littered with their own denialist «contortions» such as «oh but it will increase the atmospheric level of N2O (which is a potent greenhouse gas etc).

Not exact matches

This implies that risks are not too big or overarching (like resource scarcity, rising levels of atmospheric CO2, or global warming) but are more focused e.g. extreme weather, increased greenhouse gas emissions from agriculture or from energy use, or a lack of fresh water.

Since the 1950s, both the atmospheric CO2 level and obesity levels have increased sharply.

In our industrial world, rapidly increasing atmospheric CO2 has surpassed 400 ppm, levels not achieved since the Pliocene era about 3 million years ago, while global temperature has increased nearly 1 °C since the 1870s.

Ocean acidification, which is a direct consequence of increased atmospheric carbon dioxide levels, is expected to have a deleterious effect on many marine species over the next century.

An observed long - term increase in the number of these clouds may be due in part to the rise in atmospheric carbon dioxide levels, he says.

«However, atmospheric carbon dioxide levels aren't changing because the Earth has had time to respond via increased silicate - weathering rates.

This draft can be quickly increased if a low level jet stream exists over or near the fire, or when an atmospheric temperature inversion cap is pierced by it.

As atmospheric carbon dioxide levels increase, it becomes easier for trees to gather carbon dioxide and gives them a growing advantage over grasses.

Without the Montreal Protocol and associated agreements, atmospheric levels of ozone depleting substances could have increased tenfold by 2050.

Record emissions of carbon dioxide mean atmospheric concentrations have reached levels that lead to the highest temperature increases

«Significant increases in summer temperatures will affect the carbon cycling in the lakes, with potential consequences on atmospheric carbon dioxide levels and the Earth's climate,» he added.

The ice core data also shows that CO2 and methane levels have been remarkably stable in Antarctica — varying between 300 ppm and 180 ppm — over that entire period and that shifts in levels of these gases took at least 800 years, compared to the roughly 100 years in which humans have increased atmospheric CO2 levels to their present high.

There was virtually no atmospheric O2 present 3.4 billion years ago, but recent work from South African paleosols suggested that by about 2.96 billion years ago O2 levels may have begun to increase.

When the researchers placed the material inside a gas chamber and cranked up the air pressure from one bar (about the atmospheric pressure at sea level) to five bars, the cube's volume increased by about 3 percent.

The data show an increase in the occurrence of these specific atmospheric patterns, which is statistically significant at the 90 percent confidence level.

Gilbert explains that without a reliable method to detect missing wood, you can not understand how trees are contributing to or moderating increasing levels of global atmospheric carbon, or how apparently healthy forests and tree species are responding to shifts in climate.

During the early 2000s, environmental scientists studying methane emissions noticed something unexpected: the global concentrations of atmospheric methane (CH4)-- which had increased for decades, driven by methane emissions from fossil fuels and agriculture — inexplicably leveled off.

«Detergent» molecules may be driving fluctuations in atmospheric methane concentrations: New study suggests hydroxyl radicals may be behind unexplained recent increase in methane levels.»

«Influence of increasing carbon dioxide levels on the seabed: Storing CO2 below the seabed is one way to counteract increasing atmospheric CO2 - levels.

For example, the model predicts that production of carbon dioxide must increase with time, a finding that goes against the conventional wisdom that carbon fluxes and atmospheric carbon dioxide levels have steadily decreased over the last 4 billion years.

Because of those uncertainties, researchers can estimate only that doubling atmospheric carbon dioxide from preindustrial levels would increase global temperature between 1 °C and 5 °C.

Nonetheless mature forests do play an important role in the global carbon cycle as stable carbon pools, and clearance of forests leads to an increase of atmospheric carbon dioxide levels.

Turning up the heat seems to increase the rate at which the plants produce methane, Keppler says, which could explain why atmospheric levels of methane were high hundreds of thousands of years ago when global temperatures were balmy.

As atmospheric CO2 levels increase from burning fossil fuels, this carbon dioxide is soaked up by seawater and makes the oceans more acidic.

«With atmospheric carbon dioxide at unprecedented levels, our sense of urgency has only increased,» said Basilio.

It is well - established in the scientific community that increases in atmospheric CO2 levels result in global warming, but the magnitude of the effect may vary depending on average global temperature.

«The atmospheric and oceanic CO2 increase is being driven by the burning of fossil fuels,» says Pieter Tans, a senior scientist at the National Oceanic and Atmospheric Administration's Earth System Research Laboratory, who leads the U.S. government effort to monitor global greenhouse gas levels.

Their results showed that changes in key water - stress variables are strongly modified by vegetation physiological effects in response to increased CO2 at the leaf level, illustrating how deeply the physiological effects due to increasing atmospheric CO2 impact the water cycle.

«These results suggest that continuing increases in atmospheric CO2 associated with global climate change will increase both the level of Alternaria exposure and antigenicity [the ability to produce an immune response] of spores that come in contact with the airways.»

The researchers, thus, conclude that an increase in carbon dioxide levels caused by extremely strong vulcanism was accompanied by a decrease of atmospheric oxygen.

Even if we could determine a «safe» level of interference in the climate system, the sensitivity of global mean temperature to increasing atmospheric CO2 is known perhaps only to a factor of three or less.

For example, he said, most participants recognized that carbon dioxide increases global temperatures, yet mistakenly indicated that rising levels of atmospheric CO2 are expected to «reduce photosynthesis in plants.»

This changed ocean chemistry and reduced atmospheric CO2 levels, which increased global ice coverage and propelled Earth into severe icehouse conditions.

The Hadley Centre has calculated the massive increase in atmospheric CO2 levels if the Amazon was to die back as a result of global warming (climate models differ on how likely this is, I understand).

But the burning of oil, coal, and gas also caused most of the historical increase in atmospheric levels of heat - trapping greenhouse gases.

The study — complete details of which have been published in the journal Nature Geoscience — further revealed that the ozone levels in the atmospheric troposphere above China have increased by 7 percent between 2005 and 2010.

The evidence here is more circumstantial, but Danish researcher Lars - Georg Hersoug notes that atmospheric levels of the gas have risen during the same period and that in the United States, obesity has increased most rapidly on the East Coast, where CO2 concentrations are highest.

Thousands of studies conducted by researchers around the world have documented changes in surface, atmospheric, and oceanic temperatures; melting glaciers; diminishing snow cover; shrinking sea ice; rising sea levels; ocean acidification; and increasing atmospheric water vapor.

The Snowball Earth hypothesis maintains that the severe freezing in the late Proterozoic was ended by an increase in CO2 levels in the atmosphere, and some supporters of Snowball Earth argue that it was caused by a reduction in atmospheric CO2.

A 2008 study led by James Hansen found that climate sensitivity to «fast feedback processes» is 3 °C, but when accounting for longer - term feedbacks (such as ice sheet disintegration, vegetation migration, and greenhouse gas release from soils, tundra or ocean), if atmospheric CO2 remains at the doubled level, the sensitivity increases to 6 °C based on paleoclimatic (historical climate) data.

Observational data suggest that doubling atmospheric CO2 levels will increase the surface temperature by about 1 ° C, not the much larger values that were originally assumed in mainstream models.

If greenhouse gases were responsible for global temperature increases in recent decades, atmospheric physics require that higher levels of our atmosphere would show greater warming than lower levels.

Increased levels of atmospheric carbon dioxide could also significantly alter ocean temperatures and chemistry over the next century, which could lead to increased and more severe mass bleaching and other stressors on corIncreased levels of atmospheric carbon dioxide could also significantly alter ocean temperatures and chemistry over the next century, which could lead to increased and more severe mass bleaching and other stressors on corincreased and more severe mass bleaching and other stressors on coral reefs.

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.

Numerical computer modelling of the glacier for these different time periods will help us understand whether this part of the ice sheet is susceptible to rising sea level, warming oceans or increased atmospheric temperatures.

Complete restoration of deforested areas is unrealistic, yet 100 GtC carbon drawdown is conceivable because: (1) the human - enhanced atmospheric CO2 level increases carbon uptake by some vegetation and soils, (2) improved agricultural practices can convert agriculture from a CO2 ource into a CO2 sink [174], (3) biomass - burning power plants with CO2 capture and storage can contribute to CO2 drawdown.