Sentences with phrase «influenced change in greenhouse gases»

Not exact matches

This is the first time anyone has examined regional climate change in the central United States by directly comparing the influence of greenhouse gas emissions to agriculture, says Nathan Mueller, an earth systems scientist at the University of California (UC), Irvine, who was not involved with this study.

Their findings: natural influences such as changes in the amount of sunlight or volcanic eruptions did not explain the warming trends, but the results matched when increasing levels of greenhouse gas emissions were added to the mix.

«This study is the best estimate we have to date of how effectively behavioural change could cut US greenhouse gas emissions,» says Ruth Rettie, who leads Project Charm, a group based at Kingston University in London that investigates ways in which people's behaviour could be influenced.

In addition, both internal variability and aerosol forcing are likely to affect tropical storms in large part though changes in ocean temperature gradients (thereby changing ITCZ position and vertical shear), while greenhouse gases likely exert their influence by more uniformly changing ocean and tropospheric temperatures, so the physics of the problem may suggest this decomposition as more natural as welIn addition, both internal variability and aerosol forcing are likely to affect tropical storms in large part though changes in ocean temperature gradients (thereby changing ITCZ position and vertical shear), while greenhouse gases likely exert their influence by more uniformly changing ocean and tropospheric temperatures, so the physics of the problem may suggest this decomposition as more natural as welin large part though changes in ocean temperature gradients (thereby changing ITCZ position and vertical shear), while greenhouse gases likely exert their influence by more uniformly changing ocean and tropospheric temperatures, so the physics of the problem may suggest this decomposition as more natural as welin ocean temperature gradients (thereby changing ITCZ position and vertical shear), while greenhouse gases likely exert their influence by more uniformly changing ocean and tropospheric temperatures, so the physics of the problem may suggest this decomposition as more natural as well.

But there are vast volumes of studies concluding that rising concentrations of greenhouse gases are already influencing the climate and will continue to raise the odds of fiercer floods, drier droughts and other disruptive changes, including a quickening pace of coastal retreats (and all as human populations soar in some of the world's most vulnerable places).

there is no evidence, none, zero, that any composition change, associated with any extraordinary «greenhouse gas» change has ever left an influence on the global climate that could be seen in the geological record.

It seems oddly tendentious to deny for instance the role of natural variability on the basis that some of the recent changes in these long standing climate patterns may be influenced by greenhouse gases.

* The role of the US in global efforts to address pollutants that are broadly dispersed across national borders, such as greenhouse gasses, persistent organic pollutants, ozone, etc...; * How they view a president's ability to influence national science policy in a way that will persist beyond their term (s), as would be necessary for example to address global climate change or enhancement of science education nationwide; * Their perspective on the relative roles that scientific knowledge, ethics, economics, and faith should play in resolving debates over embryonic stem cell research, evolution education, human population growth, etc... * What specific steps they would take to prevent the introduction of political or economic bias in the dissemination and use of scientific knowledge; * (and many more...)

While it is «likely» that anthropogenic influences are behind the changes in cold days and warm days, there is only «medium confidence» that they are behind changes in extreme rainfall events, and «low confidence» in attributing any changes in tropical cyclone activity to greenhouse gas emissions or anything else humanity has done.

Any change in the strength of natural (volcanic, solar) influences based on historical variations will have an opposite effect on the influence of greenhouse gases, and thus on man - made emissions.

There is still a lot of work being done on this, but I wouldn't anticipate much of a significant change in NAO over 2005 - 2007 since there is a lot of noise and a lot of other influences — not least greenhouse gases, which with either mechanism, provide an opposing tendency.

The lines of evidence and analysis supporting the mainstream position on climate change are diverse and robust — embracing a huge body of direct measurements by a variety of methods in a wealth of locations on the Earth's surface and from space, solid understanding of the basic physics governing how energy flow in the atmosphere interacts with greenhouse gases, insights derived from the reconstruction of causes and consequences of millions of years of natural climatic variations, and the results of computer models that are increasingly capable of reproducing the main features of Earth's climate with and without human influences.

The Intergovernmental Panel on Climate Change (big pdf file) and other climate - research groups have largely rejected the hypothesis that variations in the sun's behavior could have played a big role in warming since 1950 (the period in which the panel and the vast majority of climate specialists see abundant evidence that a human - caused buildup of greenhouse gases is the main influence).

When reconstructing Earth's climate history, it can't be explained without including all the various influences, including solar irradiance, volcanism, albedo, orbital variations, continental drift, mountain building, variations in sea currents, changes in greenhouse gases, even cometary impacts.

The latest en vogue explanation linking human greenhouse gas emissions to strong winter - season East Coast storms involves changes in the characteristics of the jet stream — a river of fast moving air in the atmosphere that influences both the strength and the forward speed of extratropical storm systems.

In particular, the authors find fault with IPCC's conclusions relating to human activities being the primary cause of recent global warming, claiming, contrary to significant evidence that they tend to ignore, that the comparatively small influences of natural changes in solar radiation are dominating the influences of the much larger effects of changes in the atmospheric greenhouse gas concentrations on the global energy balancIn particular, the authors find fault with IPCC's conclusions relating to human activities being the primary cause of recent global warming, claiming, contrary to significant evidence that they tend to ignore, that the comparatively small influences of natural changes in solar radiation are dominating the influences of the much larger effects of changes in the atmospheric greenhouse gas concentrations on the global energy balancin solar radiation are dominating the influences of the much larger effects of changes in the atmospheric greenhouse gas concentrations on the global energy balancin the atmospheric greenhouse gas concentrations on the global energy balance.

«Changes in the sun's energy was one of the biggest factors influencing climate change during this period, but have since been superceded by greenhouse gases due to the industrial revolution.»

The summer - winter changes in insolation are much larger than those due to human - induced greenhouse gas changes; the seasonal change is mainly in the visible part of the electromagnetic spectrum while the greenhouse gas forcing is in the infrared; the greenhouse gas influence is global while the seasonal changes are opposite in the two hemispheres; and we have a much longer history of observing the seasonal changes, so a more or less correct prediction can be made empirically, without any physical understanding.

On the question of hurricanes, the theoretical arguments that more energy and water vapor in the atmosphere should lead to stronger storms are really sound (after all, storm intensity increases going from pole toward equator), but determining precisely how human influences (so including GHGs [greenhouse gases] and aerosols, and land cover change) should be changing hurricanes in a system where there are natural external (solar and volcanoes) and internal (e.g., ENSO, NAO [El Nino - Southern Oscillation, North Atlantic Oscillation]-RRB- influences is quite problematic — our climate models are just not good enough yet to carry out the types of sensitivity tests that have been done using limited area hurricane models run for relatively short times.

The red line incorporates natural influences like changes in solar output and volcanic activity but virtually all of the long - term warming is attributable to human - caused increases in greenhouse gasses.

This is the first time anyone has examined regional climate change in the central United States by directly comparing the influence of greenhouse gas emissions to agriculture, says Nathan Mueller, an earth systems scientist at the University of California (UC), Irvine, who was not involved with this study.

In one world, greenhouse gases, deforestation, and other climate influences were allowed to change much as they did in the real world between the mid-1800s and the presenIn one world, greenhouse gases, deforestation, and other climate influences were allowed to change much as they did in the real world between the mid-1800s and the presenin the real world between the mid-1800s and the present.

We instead conclude that solar forcing probably had a minor effect on Northern Hemisphere climate over the past 1,000 years, while, volcanic eruptions and changes in greenhouse gas concentrations seem to be the most important influence over this period.

To slow the rate of anthropogenic - induced climate change in the 21st century and to minimize its eventual magnitude, societies will need to manage the climate forcing factors that are directly influenced by human activities, in particular greenhouse gas and aerosol emissions.

Note the change of wording in the attribution statement AR4: «greenhouse gases» AR5: «human influence» Roger Pielke Sr will approve of this I think.

Global climate change is influenced by the average concentration of greenhouse gasses in the atmosphere and it does not matter where the carbon dioxide was emitted.

You may wonder why the government finds the need to pursue such action since 1) U.S. carbon dioxide emissions have already topped out and have generally been on the decline for the past 7 - 8 years or so (from technological advances in natural gas extraction and a slow economy more so than from already - enacted government regulations and subsidies); 2) greenhouse gases from the rest of the world (primarily driven by China) have been sky - rocketing over the same period, which lessens any impacts that our emissions reduction have); and 3) even in their totality, U.S. carbon dioxide emissions have a negligible influence on local / regional / global climate change (even a immediate and permanent cessation of all our carbon dioxide emissions would likely result in a mitigation of global temperature rise of less than one - quarter of a degree C by the end of the century).

There is evidence that some extremes have changed as a result of anthropogenic influences, including increases in atmospheric concentrations of greenhouse gases.

But to quantify the influences (or «forcings» in climate jargon) even further, they considered three anthropogenic forcings — well - mixed greenhouse gases, sulfate aerosols, and tropospheric and stratospheric ozone — as well as two natural forcings — changes in solar irradiance and volcanic aerosols — all of which are likely to influence tropopause height.»

I think it is really important to make that distinction - that there are a number of factors that influence the extent of Arctic sea ice, some of them of course associated with changes in the radiative forcing from the atmosphere, as a result of anthropogenic greenhouse gases and aerosols, but also changes in the atmospheric circulation and also the advection of heat into or out of the Arctic by the ocean circulation.

[38] Radiative forcing quantifies the effect of factors that influence Earth's energy balance, including changes in the concentrations of greenhouse gases.

The science on tropical cyclones is complicated and ultimately unclear in terms of the influence of greenhouse gas emissions, but is quite clear when it comes to the influence of demographics and wealth vs. climate change — the former grossly dominates the latter when it comes to future tropical cyclone disasters.