Sentences with phrase «atmospheric carbon emissions»

Long - term climate change fueled by a buildup of atmospheric carbon emissions is a controversial notion politically, but it's one accepted as fact by most scientists.

«There is a danger in believing that land carbon sinks can solve the problem of atmospheric carbon emissions because this legitimises the ongoing use of fossil fuels,» Professor Mackey said.

Not exact matches

«These studies are a wake - up call ahead of U.N. Climate Week — we must not only zero out CO2 emissions by 2050, but also rapidly limit superpollutants like HFCs and methane, and even undertake atmospheric carbon removal,» said Bledsoe, a former Clinton White House climate adviser.

Worldwide, carbon storage has the capability to provide more than 15 percent of the emissions reductions needed to limit the rise in atmospheric CO2 to 450 parts per million by 2050, an oft - cited target associated with a roughly 50 - percent chance of keeping global warming below 2 degrees, but that would involve 3,200 projects sequestering some 150 gigatons of CO2, says Juho Lipponen, who heads the CCS unit of the International Energy Agency in Paris.

«Stabilizing or reducing atmospheric carbon dioxide concentrations, therefore, requires very deep reductions in future emissions to compensate for past emissions that are still circulating in the Earth system,» the draft report says.

The model also considered how reducing soot could impact other atmospheric emissions, including sulfur dioxide, nitrous oxide and organic carbon.

The Science study finds that this is most likely because the models underestimate the atmospheric warming in the Arctic that is induced by a given carbon - dioxide emission.

Jacobson, the director of Stanford's Atmosphere / Energy Program and a senior fellow at the Woods Institute for the Environment and the Precourt Institute for Energy, said almost 8.5 billion tons of atmospheric carbon dioxide — or about 18 percent of all anthropogenic carbon dioxide emissions - comes from biomass burning.

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

Environmentalists, many of whom believe that the term «clean coal» is an oxymoron, nonetheless view the project's cancellation as yet another indication that the Bush administration lacks the commitment required to reduce the rate of growth in atmospheric carbon dioxide emissions.

Saikawa, a specialist in atmospheric chemistry, is also studying levels of black carbon emissions in the outdoor environment generated by the burning of biomass fuels like yak dung.

Certainly, the only way to stop the massive increase in atmospheric carbon dioxide is to impose a charge, either on emissions or fuel, and to allow competition to provide the cheapest alternative.

«Today atmospheric carbon dioxide emissions from burning fossil fuels are implicated in climate change, and carbon sequestered in forest biomass reduces carbon dioxide in the atmosphere.

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.

As emissions from human activities increase atmospheric carbon dioxide, they, in turn, are modifying the chemical structure of global waters, making them more acidic.

Together, they confirm estimates from atmospheric chemists that natural tropical forests absorb about a fifth of our carbon emissions.

«Changes in ocean conditions that affect fish stocks, such as temperature and oxygen concentration, are strongly related to atmospheric warming and carbon emissions,» said author Thomas Frölicher, principal investigator at the Nippon Foundation - Nereus Program and senior scientist at ETH Zürich.

A recent trend in GCMs is to extend them to become Earth system models, that include such things as submodels for atmospheric chemistry or a carbon cycle model to better predict changes in carbon dioxide concentrations resulting from changes in emissions.

If humanity does not act to reduce global greenhouse gas emissions, atmospheric carbon dioxide levels will continue to climb and Earth's average temperature will escalate.

Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

The letter notes that «Stable atmospheric concentrations of greenhouse gases would lead to continued warming, but if carbon dioxide emissions could be eliminated entirely, temperatures would quickly stabilize or even decrease over time.

Despite national and international efforts to reduce anthropogenic emissions, growing concentrations of atmospheric carbon dioxide will yield planetary warming and associated impacts for the foreseeable future.

The continued increase in the atmospheric concentration of carbon dioxide due to anthropogenic emissions is predicted to lead to significant changes in climate1.

Hi Andrew, Paper you may have, but couldn't find on «The phase relation between atmospheric carbon dioxide and global temperature» CO2 lagging temp change, which really turns the entire AGW argument on its head: http://www.sciencedirect.com/science/article/pii/S0921818112001658 Highlights: ► Changes in global atmospheric CO2 are lagging 11 — 12 months behind changes in global sea surface temperature ► Changes in atmospheric CO2 are not tracking changes in human emissions.

To derive the climate projections for this assessment, we employed 20 general circulation models to consider two scenarios of global carbon emissions: one where atmospheric greenhouse gases are stabilized by the end of the century and the other where it grows on its current path (the stabilization [RCP4.5] and business - as - usual [RCP8.5] emission scenarios, respectively).

Climate change scenarios are based on projections of future greenhouse gas (particularly carbon dioxide) emissions and resulting atmospheric concentrations given various plausible but imagined combinations of how governments, societies, economies, and technologies will change in the future.

The Arctic Monitoring and Assessment Program (AMAP) carbon assessment published in 2009 highlighted the disparity in methane emissions estimated by extrapolating data from wetlands, lakes, and coastal waters underlain by permafrost (32 to 112 Tg CH4 yr - 1) and estimates based on spatial and temporal variability of atmospheric methane concentrations (15 to 50 Tg CH4 yr - 1).

His work has shown that limiting cumulative emissions of carbon dioxide may be a more robust approach to climate change mitigation policy than attempting to define a «safe» stabilization level for atmospheric greenhouse gases.

A large ensemble of Earth system model simulations, constrained by geological and historical observations of past climate change, demonstrates our self ‐ adjusting mitigation approach for a range of climate stabilization targets ranging from 1.5 to 4.5 °C, and generates AMP scenarios up to year 2300 for surface warming, carbon emissions, atmospheric CO2, global mean sea level, and surface ocean acidification.

Empirical data for the CO2 «airborne fraction», the ratio of observed atmospheric CO2 increase divided by fossil fuel CO2 emissions, show that almost half of the emissions is being taken up by surface (terrestrial and ocean) carbon reservoirs [187], despite a substantial but poorly measured contribution of anthropogenic land use (deforestation and agriculture) to airborne CO2 [179], [216].

The total amount of carbon that would need to be diverted from being emitted into the atmosphere is stunning: Current global atmospheric CO2 emissions total roughly 30 gigatons, or 30 billion metric tons per year.

Once global carbon dioxide emissions had been reduced to zero, some combination of atmospheric decay and carbon dioxide extraction, probably partially offset by some level of carbon dioxide re-release from the worlds oceans, might possibly reduce the atmospheric carbon dioxide concentration to comply with the NAAQS.

Raymond Pierrehumbert, an Oxford University atmospheric physics professor who believes cutting carbon dioxide emissions is more urgent than cutting methane emissions, said Howarth's research offers little new information about the role of natural gas production in global warming.

Indeed, impacts of Arctic warming include the melting of major Arctic glaciers and Greenland (containing the potential for up to 7 meters of sea level rise if it were to melt entirely), the thawing of carbon rich permafrost (which could add to the burden of atmospheric greenhouse gas emissions) and signs of worsening wildfires across the boreal forests of Alaska, to name a few.

The absolutely essential first step in reducing the atmospheric concentration to 350 ppm is a total global cessation of anthropogenic carbon emissions.

In more complex models that calculate atmospheric chemistry or the carbon cycle, the boundary conditions would instead be the emissions of ozone precursors or anthropogenic CO2.

The IPCC Third Assessment Report's (TAR's) projections for methane atmospheric concentrations, carbon dioxide emissions and atmospheric concentrations, and resultant temperature increases constitute the greatest fraud in the history of environmental science.

Since over half our emissions are absorbed, that means atmospheric carbon will begin to drop.

, / ynoz, xtit = «Year», ytit = «carbon dioxide concentration (ppm)», charsize = 1.5; atmospheric carbon dioxide concentration in ppm showing target achieved plot, a (0:499) +1850, e (0:499) / max (e (0:499)-RRB- * 100, xtit = «year», ytit = «carbon dioxide emissions (AU)», charsize = 1.5; emission profile to reach target in percent of max

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 fundamental flaw in the article is in inducing the reader to believe that it would require tripling the gross vegetative uptake of the entire planet to offset the net carbon atmospheric increase, while using figures for the net vegetative uptake and the gross emissions.

Phasing out these subsidies over the next decade would achieve more than 30 percent of the cuts in carbon emissions necessary to keep rising atmospheric temperatures at no more than 2 degrees Celsius above pre-industrial levels, the IEA says.

In contrast, the CO2 emissions emitted by a coal plant represents a cumulative contribution to the atmospheric stock of carbon.

The only systematic evaluation of carbon models that were interactively coupled to climate models occurred as part of the Coupled Climate - Carbon Cycle Model Intercomparison Project (C4MIP), where Friedlingstein et al. (2006) compared the ability of a suite of models to simulate historical atmospheric CO2 concentration forced by observed emissions.

The processes of carbon release are intertwined with multiple factors, including microbial community composition, stability of old carbon, physical soil structure, and relative fraction of leaching to atmospheric emission.

If we do overshoot our carbon «budget» in the next several decades, the only way to return atmospheric CO2 concentrations to levels that avoid climate change will be to deploy large - scale CDR projects capable of generating net «negative» emissions:

«According to the cover story in Nature, the fires in Indonesia released upwards of 2.57 gigatonnes of carbon, 40 percent of the mean carbon emissions released annually from fossil fuels, and «contributing greatly to the largest annual increase in atmospheric carbon dioxide concentration detected since records began in 1957.

«As a society, we need to better understand the potential cost and performance of CDR strategies for the same reason that we need to better understand the cost and performance of emission mitigation strategies — they may be important parts of a portfolio of options to stabilize and reduce atmospheric concentrations of carbon dioxide»

The ocean uptake of excess atmospheric carbon dioxide, the excess above preindustrial levels driven by human emissions, causes well - understood and substantial changes in seawater chemistry that can affect marine organisms and ecosystems.

At the same time, evidence shows that rising atmospheric carbon dioxide, partly driven by industrial emissions, is boosting forest growth.