Sentences with phrase «by global dimming»

(Part of the How to Talk to a Global Warming Skeptic guide) Objection: Scientists claim that global warming from greenhouse gases is being countered somewhat by global dimming from aerosol pollution.

«A rapid cutback in greenhouse gas emissions could speed up global warming... because current global warming is offset by global dimming — the 2 - 3ºC of cooling cause by industrial pollution, known to scientists as aerosol particles, in the atmosphere.»

The stifling of the warming trend is generally attributed to a counteracting cooling effect caused by global dimming, an inference that has since been supported by data collected by Ramanathan and others from a number of field campaigns.

Jacobson's work is original and important in showing that cooling by global dimming is less, and less important, than the various warming impacts of this pollution.

Not exact matches

OSLO, Nov 30 (Reuters)- Climate scientists are tracking an erupting volcano on the Indonesian holiday island of Bali for clues about a possible short - cut to curb global warming by injecting sun - dimming chemicals high above the Earth.

It comes from ARM and James Hansen's references to global dimming developing from clouds being enhanced and or formed by pollution, sulfates, and or certain aerosols and so forth.

Human aerosol emissions are also offsetting a significant amount of the warming by causing global dimming.

How about BAU with carbon dioxide buildup partially masked by aerosol - induced global dimming, building climate crisis leading to a major economic recession?

No more global dimming — followed by the full effects of several more decades of high levels of CO2 emissions.

Dr Rotstayn says that «what our model is suggesting is that these droughts in the Sahel in the 1970s and the 1980s may have been caused by pollution from Europe and North America» and the commentary goes on to say «if his model is correct...» So the science is certainly not presented without caveats, and nowhere do we simply state that global dimming is unquestionably the cause of the Sahel drought.

Finally, we come to the other substantive issue raised by Dr Schmidt — whether the phenomenon of global dimming has implications for climate sensitivity.

As an aside, the radiative forcing by aerosols (in both long wave and solar radiation at the tropopause) is not the same as global dimming (which is a solar radiation effect at the surface) though they are related.

First, the transcript uses the following comment from you as the lead - in to the comments by Peter Cox predicting major effects from the decline of global dimming over the next century: «We lived in a global warming plus a Global Dimming world, and now we are taking out Global Diglobal dimming over the next century: «We lived in a global warming plus a Global Dimming world, and now we are taking out Global Ddimming over the next century: «We lived in a global warming plus a Global Dimming world, and now we are taking out Global Diglobal warming plus a Global Dimming world, and now we are taking out Global DiGlobal Dimming world, and now we are taking out Global DDimming world, and now we are taking out Global DiGlobal DimmingDimming.

If you refer to the global dimming by aerosols, I don't think it was entirely «unrecognized» beforehand.

Global dimming is indicated by measurements over land areas in many regions in the world and may therefore be a real phenomena.

``... estimate that variations in diffuse fraction, associated largely with the «global dimming» period6, 7, 8, enhanced the land carbon sink by approximately one - quarter between 1960 and 1999.

On this page... CFCs Commuting by bicycle Fossil fuels Global dimming Introduction Mining Ocean acidification Overpopulation Overpopulation: Australia Population: How to limit it?

It is also a well accepted fact that global temperature for the period ~ 1960 - 80's were affected by «global dimming»....

-- It was on Panorama about 7 years ago that I heared about James Hansen talking about how he was being «gagged» by NASA re AGW and about global dimming and how methane calthrates could eventually rise to the surface with a vision of the oceans igniting in flames — I kid you not.

You have one basic misunderstandiing about global dimming, it is not caused by CO2 but by SO2 and particulate pollution, what are called aerosols.

Their belief came about because the optical physics of aerosols, originating from Sagan and introduced to climate modelling by his ex-students, Lacis and Hansen in 1974 at GISS / NAS, predicts the cloud part of «global dimming», the increase of albedo by aerosols supposed to hide present CO2 - AGW.

, plus the need for Dr Phil Jones to bravely «hide the decline» in the tree ring data (due to the fact tree ring growth is slowed by increased cloud cover / global dimming).

Nearly half claimed AGW is offset by the cloud part of «global dimming» of which Twomey found evidence for thin clouds yet there appears no evidence for thick clouds.

Mid-century aerosol «global dimming» and the subsequent partial reduction («global brightening») have been well described in the work by Martin Wild and others.

The effects of global dimming are best evidenced by a 2 degree Celsius temperature increase in North America after all commercial flights were grounded for three days following the attacks of 9/11.

Now, how would all of this fit with the idea of GHGs - induced global warming mitigated by aerosols (global dimming)?

You could also respond to Chief's link where it states global dimming and brightening are determined by cloud cover.

Anyway 1 C per doubling falls short by a significant margin that they don't account for, and they have to ignore global dimming too.

«Historic and future increase in the global land area affected by monthly heat extremes» (Dim Coumou and Alexander Robinson 2013 Environ.

Guest commentary on BBC documentary on «Global Dimming» aired on January 13th 2005 by Beate Liepert, LDEO, Columbia University

The aerosol hypothesis is that sulfate aerosols and black carbon are the main cause of global dimming, as they tend to act to cool the Earth by reflecting and scattering sunlight before it reaches the ground.

(By the way, for those of you who already know about global cooling / dimming and aerosols, I will just say for now that these effects can not be making the blue line go down because the IPCC considers these anthropogenic effects, and therefore in the pink band.

In addition to Adrian Burd's recommendation, Al should read the comprehensive review by Wild: «Global dimming and brightening: A review» http://www.leif.org/EOS/2008JD011470.pdf «Recent brightening can not supersede the greenhouse effect as the main cause of global warming, since land surface temperatures overall increased by 0.8 °C from 1960 to 2000, even though solar brightening did not fully outweigh prior dimming within this period...» The story is nowhere near as simplistic as Al would haGlobal dimming and brightening: A review» http://www.leif.org/EOS/2008JD011470.pdf «Recent brightening can not supersede the greenhouse effect as the main cause of global warming, since land surface temperatures overall increased by 0.8 °C from 1960 to 2000, even though solar brightening did not fully outweigh prior dimming within this period...» The story is nowhere near as simplistic as Al would haglobal warming, since land surface temperatures overall increased by 0.8 °C from 1960 to 2000, even though solar brightening did not fully outweigh prior dimming within this period...» The story is nowhere near as simplistic as Al would have it.