Sentences with phrase «human emissions during»

Therefore, the increase in human emissions during the industrial revolution can not be the cause of the increase in carbon dioxide.

Not exact matches

In a paper published this month in Geophysical Research Letters, Lovejoy concludes that a natural cooling fluctuation during this period largely masked the warming effects of a continued increase in human - made emissions of carbon dioxide and other greenhouse gases.

The scientists looked at the so - called biogenic fluxes or flow of the three greenhouse gases on land that were caused by human activities over the last three decades and subtracted out emissions that existed «naturally» during pre-industrial times.

Global warming became big news for the first time during the hot summer of 1988 when now - retired NASA climate scientist James Hansen testified before Congress that the trend was not part of natural climate variation, but rather the result of emissions of CO2 and other greenhouse gasses from human activities.

Concentrations in the atmosphere have crept up since 2007, but during the same period, methane emissions from human activities and natural sources have remained stable or even fallen slightly, both studies suggest.

Human emissions however are on the decline in many countries due to more strict pollution controls on power plants like burning low - sulfur fuel and technological advances to remove it during and after combustion.

Forests and other land vegetation currently remove up to 30 percent of human carbon dioxide emissions from the atmosphere during photosynthesis, but thanks to this latest study, experts now know that we have tropical forests to thank for a great deal of this work - absorbing a whopping 1.4 billion metric tons of CO2 out of a total total global absorption of 2.5 billion metric tons.

But during a severe drought in 2005 it went into reverse, releasing 1 petagram of carbon (1 billion tons — about one - tenth of annual human emissions) to the atmosphere.

This is larger than recent years because of El Niño, and also larger than during the previous El Niño in 1997/98 because human emissions have risen since then.

Extrapolating from their forest study, the researchers estimate that over this century the warming induced from global soil loss, at the rate they monitored, will be «equivalent to the past two decades of carbon emissions from fossil fuel burning and is comparable in magnitude to the cumulative carbon losses to the atmosphere due to human - driven land use change during the past two centuries.»

Terrell Johnson, reporting on a recent NASA publication concluding that deep ocean temperatures have not increased since 2005 (http://www.weather.com/science/environment/news/deep-ocean-hasnt-warmed-nasa-20141007): «While the report's authors say the findings do not question the overall science of climate change, it is the latest in a series of findings that show global warming to have slowed considerably during the 21st century, despite continued rapid growth in human - produced greenhouse gas emissions during the same time.»

But temperatures are running so far ahead of those during the last strong El Niño, in 1997 and 1998, that scientists said the records would not be occurring without an underlying trend caused by human emissions of greenhouse gases.

A) Those who think that governments around the world should take action to reduce CO2 emissions because data collected in the last 30 years indicates that recent changes in climate can be traced to CO2 emissions from the burning of fossil fuels during various human activities.

3 claims that the GHG human emission rate is approximately 2 times larger than the observed rate during the last decades, so if the Sun drives a little bit the CO2 and CH4 cycle mechanisms (which in this case are absorbing large amount of CO2 and CH4 from the atmosphere) it might leave a signal in the CO2 and CH4 record as well.

Concludes that past human emissions of greenhouse gases are already negatively impacting statewide water resources during drought

Interestingly, during this period the atmospheric levels of CO2 (black) grew at a much faster rate than the growth of human emissions (red).

Even though human CO2 emissions rose from 6 GtC / yr to 10 GtC / yr during that span, the GHE radiative forcing attributed to CO2 for 1992 - 2014 was about 0 W m - 2.

Technology will advance far enough during that time to make the issue of runaway warming or climate change tipping points from human greenhouse gas emissions moot historical footnotes.

«Most glacier melting during last 150 years can not be said to due to human CO2 emission, nor most of the measured increase in average temperature.»

Some experts claim the rise in temperature during the past century was «unprecedented» and proof that immediate action to reduce human greenhouse gas emissions must begin.

This can't all be due to CO2 since the emissions data from the Carbon Dioxide Information Analysis Center (CDIAC) show that human - emitted CO2 wasn't rising anywhere near as fast then as during 1970 - 2000.

In fact, there is no better way to obtain a good picture of how human health and welfare may trend in the future under increases in greenhouse gas emissions than to assess how we have fared in the past during a period of increasing greenhouse gas emissions and ambient levels.

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.

... growing human CO2 emissions have caused a greater frequency of extreme climate incidents during the modern era?

And this unprecedented warming of ocean waters occurred during a 30 - year period when human CO2 emissions were some 85 % less than the modern era (166 billion tonnes of CO2 emissions versus 784 billion tonnes for the most recent 30 - year span).

Good post David... «Several of these media articles assert that our study claims the entire Earth heated up during medieval times without human CO2 emissions.

This year's temperatures now appear set to exceed 1998's values by around 0.35 C — or about one - third of the entire warming total seen since large - scale human greenhouse gas emissions began during the late 19th century.

Richart Tol (2013), Figure 3 shows that GHG emissiosn were net beneficial during last century and projects that will continue for most of this century (all of the century if you exclude hypothesised increasing energy consumption assumed caused by human's GHG emissions).

The latter is a politico -(pseudo) scientific construct, developed since the late - 1980s, in which the human emission of «greenhouse gases», such as carbon dioxide and methane, is unquestioningly taken as the prime - driver of a new and dramatic type of climate change that will inexorably result in a significant warming during the next 100 years and which will inevitably lead to catastrophe for both humanity and the Earth.

«The Australian National University announced the discovery on Sunday, claiming evidence shows human - caused greenhouse gas emission during the past 45 years has increased the rate of temperature rise to 1.7 degree Celsius per century, «dwarfing the natural background rate,» according to Will Steffen, a climate change expert and ANU professor.»

«Humans added plenty greenhouse gases before industrialisation» The author's quote methane emissions annually were greater during the Roman Period than that of all the current world landfill sites.

The most influential of the greenhouse gases, carbon dioxide emissions have been increasing significantly during the last few centuries due to human activity.

Here, we argue that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist.

In March 2007, Hansen told the House of Representatives Committee on Oversight and Government Reform, «The effect of the filtering of climate change science during the current administration has been to make the reality of climate change less certain than the facts indicate, and to reduce concern about the relation of climate change to human - made greenhouse gas emissions.»

There is no strong direct relationship between the human caused emissions of a single year and the uptake from the atmosphere during the same year.

RE: The Over-whelming scientific Consensus on man - made CO2 caused Global - warming - 97 % of the climate scientists surveyed believe «global aver temps have increased» during the past century [So do I]-- Your quotes: How «significant it is that 84 % of climate scientists have reached a «consensus» that «human - induced warming is occurring» «--RCB- 84 % «personally believe» [implies they may NOT have actually studied this topic — IE: may NOT be experts on this particular matter] human - induced warming is occurring -LCB--... — «In 1991 only 41 % of climate scientists were very confident that industrial emissions of greenhouse gases were responsible for climate disruption.

The green bar shows the amount of warming caused by human greenhouse gas emissions during that time.

Therefore, I think a statement like «The green bar shows the amount of warming caused by human greenhouse gas emissions during that time.»

Then we are told that natural factors have masked AGW over a recent short time period during which there was no observed warming yet close to one - third of all human CO2 emissions since industrialization have occurred.

The Earth is warmer (in an average sense) now than it has been at any time during the past 2000 years because of CO2 emissions from humans burning fossil fuels.

Impact of human emissions on the atmospheric mercury reservoir during recent decades.

Almost one third of all human emissions have taken place since 1998, but warming has slowed dramatically during that same time frame.

Thus, firn air collected at Summit becomes a powerful archive to infer the impact of human emissions on the atmospheric reservoir during recent decades.

http://www.eia.doe.gov/oiaf/1605/ggccebro/images/New%20Fig%201.gif During the past 20 years, about three - quarters of human - made carbon dioxide emissions were from burning fossil fuels.»

I don't know — but it seems that the advocates of consensus climate change define things to make humans look as bad as possible and fail to take into consideration the positive results of increased warmth, the enhanced crop growth, the lower cost to heat a home during winter, the increased CO2 sinks which are absorbing 1/2 of our emissions and so on.

Argues that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist