Sentences with phrase «occurs as greenhouse gases»

Not exact matches

Some greenhouse gases occur naturally in the atmosphere, while others result from human activities such as burning of fossil fuels such as coal.

David Rupp of Oregon State University and his colleagues estimate that the conditions were 20 times as likely to occur in the late 2000s as in the 1960s, due to the added greenhouse gases (Bulletin of the American Meteorological Society, doi.org/j7r).

Similar frozen methane hydrates occur throughout the same arctic region as they did in the past, and warming of the ocean and release of this methane is of key concern as methane is 20x the impact of CO2 as a greenhouse gas.

«With this tool we can examine not only carbon emissions, but also those of other greenhouse gases, and as a result tease apart the cost - effectiveness of the scenarios as well as identify what and where impacts are likely to occur for a range of resources,» says Daniel Kammen.

However, the climate warming commitment from past greenhouse - gas emissions is more correctly defined as a «zero - emissions commitment» — that is, the future climate change that would occur, should greenhouse - gas emissions be eliminated entirely.»

In the example of climate change, Pielke Jr says, many researchers have taken one of two sides: backing either mitigation policies to reduce greenhouse - gas emissions, or adaptation policies to deal with climate change as it occurs.

These bed filters and hydrous manganese oxide technologies are expected to reduce the naturally occurring radioactive materials generated during the removal of radioactivity by 90 %, as well as cutting treatment costs and greenhouse gas emissions.

The abstract includes the statement: «Evidence is presented that the recent worldwide land warming has occurred largely in response to a worldwide warming of the oceans rather than as a direct response to increasing greenhouse gases (GHGs) over land.»

This dramatic increase in temperature occurs rapidly over 5,000 to 7,000 years as glacial sheets begin to decrease in size, sea levels rise and greenhouse gases increase.

If we accept that greenhouse gases are warming the planet, the next concept that needs to be grasped is that it takes time, and we have not yet seen the full rise in temperature that will occur as a result of the CO2 we have already emitted.

Global climate change will occur as a result of global warming resulting from the greenhouse effect caused by the retention of heat in the lower atmosphere of the Earth caused by the concentration of gases of various kinds.

As here, refuting Jon Kirwan's concern (# 150): «the speediest drop in greenhouse gas pollution on record occurred in France in the 1970s and «80s, when that country transitioned from burning fossil fuels to nuclear fission for electricity, lowering its greenhouse emissions by roughly 2 percent per year.»

# 102 Kevin: SA claims that «observed effects of the warming that has already occurred as a result of the greenhouse gases we have already emitted... are already causing massive and costly harm.»

The whole problem of how much warming will occur convolves lots of questions involving how the climate reacts to greenhouse gases, the carbon cycle, and our future path as societies in terms of our energy use (and other emissions).

Some of them are optimal fingerprint detection studies (estimating the magnitude of fingerprints for different external forcing factors in observations, and determining how likely such patterns could have occurred in observations by chance, and how likely they could be confused with climate response to other influences, using a statistically optimal metric), some of them use simpler methods, such as comparisons between data and climate model simulations with and without greenhouse gas increases / anthropogenic forcing, and some are even based only on observations.

With regards the Arctic: As Gillett et al and Johanessen et al show — in models without the anthropogenic increase of greenhouse gasses the Arctic warming does not occur, add the GHG effect and the warming occurs in all ensembles.

Mass extinctions, of more than half the species on the planet, have occurred several times when the Earth warmed as much as expected if greenhouse gases continue to increase.

People here and abroad have gotten engaged where climate trends become obvious like in the Arctic, and when weather events occur that either they believe are to some degree related to the ghg [greenhouse gas] buildup directly, or serve as images of the futures.

The actual observed effects of the warming that has already occurred, as a result of the greenhouse gases we have already emitted, are self - evidently already «dangerous» since they are already causing massive and costly harm.

Climate change occurs from the excess accumulation of greenhouse gas emissions to the atmosphere with carbon dioxide (CO2) as the dominant and as the longest lasting one.

However, taking account of sampling uncertainty (as most more recent detection and attribution studies do, including those shown in Figure 9.9) makes relatively little difference to estimates of attributable warming rates, particularly those due to greenhouse gases; the largest differences occur in estimates of upper bounds for small signals, such as the response to solar forcing (Allen and Stott, 2003; Stott et al., 2003a).

Shifting currents, increased freshwater input from melting sea ice and glaciers, and changes in upper and lower sea - level circulation patterns are already occurring, and they'll progress rapidly if anthropogenic greenhouse gas emission continues under a business - as - usual scenario.

If the Earth stays on its current course without reversing greenhouse gas emissions, and global temperatures rise 5 degrees Celsius, as scientists say is possible, the pace of change will be at least 50 times and possibly 100 times swifter than what's occurred in the past, Field said.

As greenhouse gases including CO2 are evenly distributed in the atmosphere, the highest amount of greenhouse gas warming should have occur at the equator.

«The human impact on global climate is small, and any warming that may occur as a result of human carbon dioxide (CO2) and other greenhouse gas emissions is likely to have little effect on global temperatures, the cryosphere (ice - covered areas), hydrosphere (oceans, lakes, and rivers), or weather.

This involves recasting the Renewable Energy Directive, and occurs at the same time as the European Council has asked the Commission to produce an updated 2050 greenhouse gas emissions reduction plan.

The greatest surge in manmade CO2 (plus methane, ethane, nitrogen and sulfur oxides, and many more so - called greenhouses gases) occurred from 1940, as the industrialized world experienced an explosive growth in (95 % coal - fired) heavy industry, first for armaments in WWII, then infrastructure and industrial rebuilding and consumer durables (cars, refrigerators etc.) in the post war boom.

One of the problems with the EPA's Endangerment TSD is the nearly complete disregard of observed trends in a wide array of measures which by and large show that despite decades of increasing anthropogenic greenhouse gas emissions the U.S. population does not seem to have been adversely affected by any vulnerabilities, risks, and impacts that may have arisen (to the extent that any at all have actually occurred as the result of any human - induced climate changes).

Models predict that the same summertime temperatures that ranked among the top 5 % in 1950 — 1979 will occur at least 70 % of the time by 2035 — 2064 in the U.S. if global emissions of greenhouse gases grow at a moderate rate (as modeled under the IPCC SRES A2 scenario).

The causal case is a cumulative case of: 1) correlation + 2) well - evidenced mechanism (i.e. plausibility) + 3) primacy, where the proposed cause occurs before the effect + 4) robustness of the correlation under multiple tests / conditions + 5) experimental evidence that adding the cause subsequently results in the effect + 6) exclusion of other likely causes (see point 7 as well) + 7) specificity, where the effect having hallmarks of the cause (ex: the observed tropospheric warming and stratopsheric cooling, is a hallmark of greenhouse - gas - induced warming, not warming from solar forcing) 8) a physical gradient (or a dose - response), where more of the cause produces a larger effect, or more of the cause is more likely to produce the effect +....

While this is categorically false (the last decade was the warmest on record and 2005 and 2010 are generally considered tied for the warmest year), scientists do admit that warming hasn't occurred over land as rapidly as predicted in the last ten years, especially given continually rising greenhouse gas emissions.

Additional escalation of the mining impact occurs as conventional oil mining is supplanted by tar sands development, with mining and land disturbance from the latter producing land use - related greenhouse gas emissions as much as 23 times greater than conventional oil production per unit area [152], but with substantial variability and uncertainty [152]--[153].

This rapid warming is consistent with the scientific understanding of how the climate should respond to a rapid increase in greenhouse gases like that which has occurred over the past century, and the warming is inconsistent with the scientific understanding of how the climate should respond to natural external factors such as variability in solar output and volcanic activity.

Similarly, the climate scenarios were based on 2xCO2 equilibrium GCM projections from three models, where the radiative forcing of climate was interpreted as the combined concentrations of CO2 (555 ppm) and other greenhouse gases (contributing about 15 % of the change in forcing) equivalent to a doubling of CO2, assumed to occur in about 2060.

Needless to say, an occasional cold month doesn't negate the long - term temperature rise occurring both nationally and globally as a result of human - produced greenhouse gases.

The fact that the climate system can vary internally without external forcing is no reason to suspect that it does not also respond to external forcings, such as the strong response to increasing greenhouse gas concentrations that has occurred in the latter half of the 20th century.

«Evidence is presented that the recent worldwide land warming has occurred largely in response to a worldwide warming of the oceans rather than as a direct response to increasing greenhouse gases (GHGs) over land.

Some actions, such as emissions of greenhouse gases, cause changes in multiple dimensions that occur over extended periods.

[T] hey can change their pattern of energy production and usage in order to limit emissions of greenhouse gases and hence the magnitude of climate changes; they can wait for changes to occur and accept the losses, damage and suffering that arise; they can adapt to actual and expected changes as much as possible; or they can seek as yet unproven «geoengineering» solutions to counteract some of the climate changes that would otherwise occur.

There are two prominent and undeniable examples of the models» insufficiencies: 1) climate models overwhelmingly expected much more warming to have taken place over the past several decades than actually occurred; and 2) the sensitivity of the earth's average temperature to increases in atmospheric greenhouse gas concentrations (such as carbon dioxide) averages some 60 percent greater in the IPCC's climate models than it does in reality (according to a large and growing collection of evidence published in the scientific literature).

Global Warming is being caused by both the human release of greenhouse gases from the burning of fossil fuels (oil, coal) and a natural warming cycle the Earth is going through As the global temperature begins to rise many changes will occur to climates around the world Complete the global warming simulation on the class webpage.

They also specify that naturally - occurring removals, including removals as a consequence of indirect anthropogenic effects, should be excluded from the system and that any re-release of greenhouse gases (e.g. through forest fires) must be promptly accounted for.

However, the climate warming commitment from past greenhouse - gas emissions is more correctly defined as a «zero - emissions commitment» — that is, the future climate change that would occur, should greenhouse - gas emissions be eliminated entirely.»

So, although I have a lot of respect for Hansen, who has the track - record of saying things that seem a bit far - out at the time but later become quite well - accepted by the scientific community (such as when he pronounced back in the late 1980s that the warming occurring was almost definitely due to greenhouse gases), I think it is at best premature to give much credence to this particular prediction of Hansen's.

Specifically, the term is defined as how much the average global surface temperature will increase if there is a doubling of greenhouse gases (expressed as carbon dioxide equivalents) in the air, once the planet has had a chance to settle into a new equilibrium after the increase occurs.

The most significant increase (in red, as observed with Japan's Greenhouse Gases Observing Satellite) occurred in the central United States.

I think he also makes the point that as measure and model the change in climate caused by greenhouse gas, natural variation is occurring.

Eli - If temperature gradients were larger (as might occur with zero greenhouse gases) then natural convection will tend to be higher.

Whereas the greenhouse effect is a naturally occurring process, its enhancement due to increased release of greenhouse gases (CO2 and other gases, such as methane and ozone) is called global warming.

And that lull in warming has occurred even as greenhouse gases have accumulated in the atmosphere at a record pace... The slowdown is a bit of a mystery to climate scientists.