Sentences with phrase «high atmospheric carbon»

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.

Other researchers have already suggested that high atmospheric carbon dioxide levels, driven by enormous, slow volcanic eruptions, could have turned the oceans increasingly acidic.

«With record - high atmospheric carbon concentrations and the rising threat of extreme heat, drought, wildfires and super storms,» the letter reads, «America's energy policies must reduce our dependence on fossil fuels, not simply reduce our dependence on foreign oil.»

The Triassic was also a hothouse world: a time of high atmospheric carbon dioxide, rapid climate shifts, and fast - moving extinctions.

The future impacts of anthropogenic global change on marine ecosystems are highly uncertain, but insights can be gained from past intervals of high atmospheric carbon dioxide partial pressure.

«They are using this information to test state - of - the - art climate models under conditions of high atmospheric carbon dioxide concentrations, similar to those expected by the end of this century.»

The researchers believe the greening is a response to higher atmospheric carbon dioxide inducing decreases in plant stomatal conductance — the measure of the rate of passage of carbon dioxide entering, or water vapor exiting, through the stomata of a leaf — and increases in soil water, thus enhancing vegetation growth.

A report published last year by the National Institutes of Health attributes greater pollen to higher atmospheric carbon dioxide — the result of industrial and automotive pollution.

The impact of higher temperature and marine productivity is evaluated in the model as a result of higher atmospheric carbon dioxide and oceanic nutrient concentrations.

Damage to coral reefs from higher ocean temperatures and ocean acidification caused by higher atmospheric carbon dioxide levels, as well as damage from pollution and sedimentation, are threatening these breeding grounds for fish in tropical and subtropical waters.

In another journal, Geohealth, Dr Myers and a different set of colleagues warn that higher atmospheric carbon dioxide levels are also associated with lower iron content in food crop staples.

Increased weed and pest pressure associated with longer growing seasons and warmer winters will be an increasingly important challenge; there are already examples of earlier arrival and increased populations of some insect pests such as corn earworm.64 Furthermore, many of the most aggressive weeds, such as kudzu, benefit more than crop plants from higher atmospheric carbon dioxide, and become more resistant to herbicide control.72 Many weeds respond better than most cash crops to increasing carbon dioxide concentrations, particularly «invasive» weeds with the so - called C3 photosynthetic pathway, and with rapid and expansive growth patterns, including large allocations of below - ground biomass, such as roots.73 Research also suggests that glyphosate (for example, Roundup), the most widely - used herbicide in the United States, loses its efficacy on weeds grown at the increased carbon dioxide levels likely to occur in the coming decades.74 To date, all weed / crop competition studies where the photosynthetic pathway is the same for both species favor weed growth over crop growth as carbon dioxide is increased.72

Higher atmospheric carbon dioxide levels are wholly beneficial.

There are no deleterious consequences of higher atmospheric carbon dioxide levels.

Not exact matches

The relatively pleasant global climate of the past 10,000 years is largely thanks to higher levels of atmospheric carbon dioxide

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

Also associated with this event are high levels of carbon dioxide in the atmosphere, which are linked to elevated ocean and atmospheric temperatures.

Black carbon aerosols — particles of carbon that rise into the atmosphere when biomass, agricultural waste, and fossil fuels are burned in an incomplete way — are important for understanding climate change, as they absorb sunlight, leading to higher atmospheric temperatures, and can also coat Arctic snow with a darker layer, reducing its reflectivity and leading to increased melting.

The seven - day rainfall total from Harvey was as much as 40 percent higher than rainfall from a similar storm would have been decades ago, before human activity caused atmospheric carbon dioxide levels to spike, according to a study published yesterday in Geophysical Research Letters.

«Wheat's photosynthetic pathway evolved 100 million years ago when atmospheric carbon dioxide levels were up to 10 times higher than they are today,» he said.

Although plants grown in high levels of carbon dioxide — say, double the current atmospheric concentrations — initially grow rapidly, the growth tapers off within weeks and the plants wind up with a low protein content.

The OCO mission aimed to make unique and high quality measurements of the atmospheric column of carbon dioxide at high spatial resolution.

The atmospheric concentration of carbon dioxide, a critical greenhouse gas, is higher than it has been for at least 650,000 years.

Even if all greenhouse emissions were to stop today, atmospheric carbon dioxide will remain high for millennia, and ocean surface temperatures will stay elevated even longer, a new study predicts.

Dr Tina Van De Flierdt, co-author from the Department of Earth Science and Engineering at Imperial College London, says: «The Pliocene Epoch had temperatures that were two or three degrees higher than today and similar atmospheric carbon dioxide levels to today.

«Modern atmospheric carbon dioxide levels are today equivalent to those about three million years ago, when sea level was at least six meters higher because the ice sheets were greatly reduced.

Within that range of atmospheric density, even higher concentrations of carbon dioxide wouldn't have been adequate to counteract the faint young sun, suggesting that methane, ethane or other strong greenhouse gases kept Earth from freezing.

The tropical rainforest was able to persist under elevated temperatures and high levels of atmospheric carbon dioxide,.......

April will be the first time in human history where levels of atmospheric carbon dioxide were higher than 400 parts per million for an entire month, one scientist who monitors the levels said.

The definition uses atmospheric databases called HITRAN (high - resolution transmission molecular absorption) and HITEMP (high - temperature spectroscopic absorption parameters) that characterize planetary atmospheres in light of how both carbon dioxide and water are absorbed.

«We find this fingerprint both in a high - resolution climate model in response to increasing atmospheric carbon dioxide concentrations, and in the temperature trends observed since the late nineteenth century.»

The higher concentrations of atmospheric carbon dioxide throughout the PETM decreased the nutritional value of plant material, however, leading to a temporary decrease in the size of some herbivorous insects and mammals.

By 2100, the ocean uptake rate of 5 Gt C yr - 1 is balanced by the terrestrial carbon source, and atmospheric CO2 concentrations are 250 p.p.m.v. higher in our fully coupled simulation than in uncoupled carbon models2, resulting in a global - mean warming of 5.5 K, as compared to 4 K without the carbon - cycle feedback.

For example, they describe the unexpectedly high amounts of beetle herbivory in soybeans in response to elevated atmospheric carbon dioxide, as evidenced by FACE experiments.

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.

SkS 22 May guest post on variability of the land carbon sink and generally higher CO2 atmospheric growth during El Nino events.

A new study by Stanford University atmospheric scientist Mark Jacobson has revealed that worsening air pollution and higher carbon dioxide emissions go hand - in - hand - the results suggest intensifying global warming will increase the number of smog - related deaths.

The response time of atmospheric pCO2 ought to be faster than the response time of carbon isotopes, but then it is unclear to me what would be keeping the temperature up, if not higher CO2.

The higher CO2 concentration does lead to additional uptake where deforestation is not occurring; however, the conversion to long - lived soil carbon is quite slow so additional biospheric disturbance (or a decline in atmospheric CO2) in the future could lead to its release.

And, the IPCC projection is probably too high because it was driven by a collection of climate models which new science indicates produce too much warming given a rise in atmospheric carbon dioxide levels.

You may wish to check these out yourself, Fred, to get a better picture of how the natural carbon cycle is responding to higher atmospheric CO2 concentrations.

Asked to rate each energy technology's potential to decrease atmospheric carbon levels over the next 25 years, the number of respondents seeing «high potential» for solar electric, for example, dropped to 66 percent from 74 percent.

NOTE: The top two scenarios estimate an atmospheric CO2 level which exceeds the total carbon contained in all the optimistically estimated fossil fuel reserves on our planet (although here I will mention that Pekka Pirilä has found a study, which give higher potential fiossil fuel reserves than the studies, which I cited).

The next uncertainty is embedded in the response of the natural world to ever - higher ratios of atmospheric carbon.

The year as a whole gave miserable summer weather to many, and there has been no upward trend of temperatures since the highs of 1998, despite steadily rising atmospheric carbon dioxide levels.

in response to the increase of atmospheric carbon dioxide, the excess of precipitation over evaporation increases, and surface salinity is reduced in high latitudes as noted in section 8.

Some regions may even shift from being a carbon sink to being an atmospheric carbon dioxide source, 50,51,52 though large uncertainties exist, such as whether projected disturbances to forests will be chronic or episodic.31 Midwest forests are more resilient to forest carbon losses than most western forests because of relatively high moisture availability, greater nitrogen deposition (which tends to act as a fertilizer), and lower wildfire risk.50, 51,53

From the University of California — Riverside, and the department of sulfurous odors, comes this «it must be carbon dioxide» moment: «Also associated with this event are high levels of carbon dioxide in the atmosphere, which are linked to elevated ocean and atmospheric temperatures.

«We find this fingerprint both in a high - resolution climate model in response to increasing atmospheric carbon dioxide concentrations, and in the temperature trends observed since the late nineteenth century.»

Using the UN's «medium fertility» population growth rate projection and the assumed higher per capita carbon footprint plus the assumption that 50 % of the emitted CO2 will «remain» in the atmosphere, we arrive at an estimated atmospheric CO2 concentration of 640 ppmv by 2100.