Sentences with phrase «human greenhouse gas forcing»

Not exact matches

The researchers [3] quantified China's current contribution to global «radiative forcing» (the imbalance, of human origin, of our planet's radiation budget), by differentiating between the contributions of long - life greenhouse gases, the ozone and its precursors, as well as aerosols.

Soon is a leading skeptic of the widely accepted science surrounding climate change, In the International Journal of Public Opinion Research, a study titled «The Structure of Scientific Opinion on Climate Change» found that 97 percent of scientists surveyed believed global warming already is ongoing, with 84 percent of scientists surveyed believing human - produced greenhouse gases were the driving force behind the change.

If one accepts Ruddiman's hypothesis, one implicitly agrees that: i) CO2 and CH4 can be affected by human activity, ii) greenhouse gases have a significant forcing role, and iii) climate sensitivity is in the ballpark of mainstream estimates.

The importance of heterogeneous human climate forcings does not diminish the important of added greenhouse gases, but does indicate that more attention needs to be given to these other human climate forcings, including how they can modify atmospheric and ocean circulation features.

Forcings, measured in W / m2 averaged over the globe, are imposed perturbations of Earth's energy balance caused by changing forcing agents such as solar irradiance and human - made greenhouse gases (GHGs).

And we're pushing on it with growing force, through the rapid buildup of long - lived greenhouse gases flowing from human activities (including burning all that oil we're sucking from seabeds).

After each of its four reports so far — including the pivotal 2007 assessment that concluded with 90 percent confidence that greenhouse gases from humans were the main force behind recent warming --- the panel leadership has met to consider changing how it works.

A task force assembled by the American Psychological Association hopes to spur more research on the role of the human mind in shaping the behaviors resulting in rising greenhouse - gas emissions as well as on traits that can impede an effective response to global warming and similar slow - building environmental risks.

I don't think anyone denies that the sun matters for climate, but the question is whether the variability of the sun in recent history has had the impact that we project from greenhouse gases over the next 100 — and there, I think, a majority of your «AGW» ers» would think the evidence suggests that changes in human forcing will likely be several times (at least) larger than any solar variability we've seen in a thousand years or more.

When I'm forced to compress it down to just those two words I'm talking about the human influence on the climate system through the buildup of greenhouse gases in the atmosphere.

When I have seen the «climate has always changed», it has almost invariably been used to argue that somehow human - produced greenhouse gases can not force climate, so that the observed change is somehow «natural».

«In addition to greenhouse gas emissions, other first - order human climate forcings are important to understanding the future behavior of Earth's climate.

Therefore, the cost - benefit analyses regarding the mitigation of CO2 and other greenhouse gases need to be considered along with the other human climate forcings in a broader environmental context, as well as with respect to their role in the climate system.»

There is one and only one justification for a carbon tax — an attempt to influence the future course of the earth's climate (or, as some people prefer, to mitigate anthropogenic climate change) by trying to force down the emissions of the most abundant human - generated greenhouse gas.

Putting it all together, Figure 2 compares the warming from human caused greenhouse gases to the total radiative forcing from all human sources.

In 2013, the Intergovernmental Panel on Climate Change Fifth Assessment Report stated a clear expert consensus that: «It is extremely likely [defined as 95 - 100 % certainty] that more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by the anthropogenic [human - caused] increase in greenhouse gas concentrations and other anthropogenic forcings together.»

While a single heat wave doesn't make a worldwide meltdown..., a great many scientists believe that by continuing to pump greenhouse gases into the atmosphere, humans are forcing drastic climate changes.

Black — Observed Warming, Green — greenhouse gases, Orange — total Influence from human factors, Yellow — other human factors, Blue — Natural Factors (volcanos and solar forcing).

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.

Therefore, our results confirm that positive radiative forcings (e.g., from human - caused increases in greenhouse gas concentrations) are necessary in order for the Earth to have warmed as much as it did over the 20th century.

Maybe you don't know much about the sum of radiative forcings, or findings from paleoclimate, that allow climatologists to calculate that human emissions of greenhouse gases are responsible for 100 + % of recent warming, but that doesn't mean nobody does.

Humans cause numerous other radiative forcings, both positive (e.g. other greenhouse gases) and negative (e.g. sulfate aerosols which block sunlight).

Last week, a team of 19 top climate scientists from government labs in the United States and Europe reported that the buildup of human - induced greenhouse gases in the atmosphere appeared to be the primary driving force behind warmer oceans that fuel more powerful hurricanes.

There, as with much of Siberia, temperatures have been forced to rapidly warm by human greenhouse gas emissions.

My bottom line is that while the global climate models, when run with added CO2 and other greenhouse gases, show that this is a warming effect, they are inadequate tools to assess the consequences of these human climate forcings on the regional and local scale.

«Today, Hansen's team estimates the human forcing from greenhouse gases to be about 3 watts per square meter (warming) and the forcing from aerosols to be about minus 1.5 watts per square meter (cooling).»

The rise in temperatures along the U.S. West Coast during the past century is almost entirely the result of natural forces — not human emissions of greenhouse gases, according to a major new study released today in the Proceedings of the National Academy of Sciences.

«causes of the earlier warming are less clear since this period precedes the time of strongest increases in human - induced greenhouse gas (radiative) forcing.»

While the latter warming is often attributed to a human - induced increase of greenhouse gases, causes of the earlier warming are less clear since this period precedes the time of strongest increases in human - induced greenhouse gas (radiative) forcing.»

A linear warming trend plus natural cycles can be mistaken for a step function, but physically the global warming is caused by an external radiative forcing (i.e. human greenhouse gas emissions).

Well it's even more complex than that because the net warming from humans doesn't just involve CO2, but other greenhouse gases and it factors in the cooling effect of aerosols being dwarfed by the CO2 forcing.

Schematic diagram of human - made climate forcings by greenhouse gases, aerosols, and their net effect.

All these impacts are the direct result of human greenhouse gas emissions and their forcing effect on the world's climate.

The 2007 report focussed on greenhouse gasses, he said, whereas the 2013 report included all «anthropogenic forcings», including «the cooling effect from human aerosol emissions».

My question woiuld be: What happens when human related forcing such as aerosols, sulfur emission, etc. act in opposition to other human related forcing such as greenhouse gas emissions?

For «skeptics» to make a convincing argument that humans are not causing global warming, they must both explain where this large greenhouse gas radiative forcing has gone, and find an even larger «natural» radiative forcing which nobody has yet identified.

Over the past several centuries, human greenhouse gas emissions have caused by far the largest radiative forcing (energy imbalance), and thus must be the driver of any observed long - term global warming.

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.

Powerful ocean heat pulses of the kind we observe now, when combined with an extraordinary human greenhouse gas heat forcing, also increases the likelihood of another record warm year.

«There is evidence of an emerging pattern of climate response to forcing by greenhouse gases and sulfate aerosols... from the geographical, seasonal and vertical patterns of temperature change... These results point toward a human influence on global climate.»

The magnitude of the imbalance agrees with what we calculated using known climate forcing agents, which are dominated by increasing human - made greenhouse gases,» said lead author James Hansen, director of the NASA Goddard Institute for Space Studies.»

The human - made greenhouse gas climate forcing is now relentlessly, monotonically, increasing at a rate that overwhelms variability of natural climate forcings.

A study by scientists at NASA's Jet Propulsion Laboratory in Pasadena, California, and Duke University in Durham, North Carolina, shows, in detail, the reason why global temperatures remain stable in the long run unless they are pushed by outside forces, such as increased greenhouse gases due to human impacts.

The control run uses constant values for the radiative forcing due to heat - trapping gases (greenhouse gases) and human - induced aerosols appropriate to pre-industrial conditions.

Based on an extensive literature review, we suggest that (1) climate warming occurs with great uncertainty in the magnitude of the temperature increase; (2) both human activities and natural forces contribute to climate change, but their relative contributions are difficult to quantify; and (3) the dominant role of the increase in the atmospheric concentration of greenhouse gases (including CO2) in the global warming claimed by the Intergovernmental Panel on Climate Change (IPCC) is questioned by the scientific communities because of large uncertainties in the mechanisms of natural factors and anthropogenic activities and in the sources of the increased atmospheric CO2 concentration.

The model included a more comprehensive set of natural and human - made climate forcings than previous studies, including changes in solar radiation, volcanic particles, human - made greenhouse gases, fine particles such as soot, the effect of the particles on clouds and land use.

The largest climate forcing today, i.e. the greatest imposed perturbation of the planet's energy balance [1,2], is the human - made increase in atmospheric greenhouse gases (GHGs), especially CO2 from the burning of fossil fuels.

These human forcings include greenhouse gas emissions (e.g. CO2, methane, CFCs), aerosol emissions and deposition [e.g., black carbon (soot), sulfates, and reactive nitrogen], and changes in land use and land cover.

Decades of research by hundreds of independent scientific and academic institutions around the globe have discovered that human - caused climate change involves forcings such as the radiative forcing of well - mixed greenhouse gases, as well as land cover changes.

«In addition to greenhouse gas emissions, other first - order human climate forcings are important to understanding the future behavior of Earth's climate.