Sentences with phrase «global concentrations»

It increases the ability to predict how changes in land use or climate warming could affect the sources and global concentrations of greenhouse gases in the atmosphere.

Global concentrations of methane, a powerful greenhouse gas and one of the causes of climate change, are now growing faster in the atmosphere than any other time in the past 20 years.

Indeed, it's almost certain we will exceed 450ppmv before we stabilise global concentrations of atmospheric CO2 and it's virtually certain that this continuing upward trend will be reflected in serious costs to the human comnunities who encounter it.

As the agency put it, «Atmospheric concentrations increased by 4.4 molecules for every billion molecules of air, bringing the total global concentration up to 1788 parts per billion.»

Carbon levels fluctuate depending on the region and the season and scientists say global concentrations will likely remain at around 395 ppm for the time being.

Leave aside, for the moment, that the goal is not compatible with doing our fair share while stabilizing global concentrations of greenhouse gasses below 450ppm.

As global concentration of CH4 rose in the 1980s and 1990s, so did its carbon - 13 content, leading observers to finger the former Soviet Union's creaky gas infrastructure.

The World Meteorological Organization's Annual Greenhouse Gas Bulletin raised serious concerns about a new high average global concentration of carbon dioxide in the atmosphere.

«Five years of data is not enough to comment on a trend but we show that even with a modest amount of surface warming the methane release from these wetlands has affected global concentrations of methane,» he said.

Assuming comparable measures by other developing countries, this would probably be consistent with stabilising global concentrations of greenhouse gases at around 550 parts per million.

In the Northern hemisphere, the global concentration of carbon dioxide levels during a 90 - day period crossed the 400 parts per million threshold for the first time.

We have more than doubled the global concentration of aerosols such as soot since pre-industrial times

During the early 2000s, environmental scientists studying methane emissions noticed something unexpected: the global concentrations of atmospheric methane (CH4)-- which had increased for decades, driven by methane emissions from fossil fuels and agriculture — inexplicably leveled off.

One possible source is a 1938 study by pioneering climate scientist Guy Callendar in which he predicted that doubling the global concentration of carbon dioxide from pre-industrial levels would result in around 2 °C of warming.

In the late 1980s, studies carried out by several researchers, including Joel Levine at NASA's Langley Research Center, Hampton, Virginia, revealed that the global concentration of carbon monoxide had risen by between 1 and 2 per cent a year for at least 30 years.

Mauna Loa Observatory in Hawaii used to measure CO2 levels to infer a global concentration.

The crucial question, however, remains unanswered - is the increase sufficient to notably change the global concentration of marsh gas in the air?

Just Monday, the United Nations weather agency announced that global concentration of C02 had exceeded most forecasts, hitting record levels.

As permafrost temperatures have been increasing faster than air temperatures in the Arctic, scientists have questioned whether these heat - trapping gases could be released into the atmosphere, increasing their global concentrations.

Among the facts that are clear, however, are that U.S. emissions contribute very little to global concentrations of greenhouse gas, and that even substantial cuts in these emissions are likely to have no effect on temperature.

Will the greenhouse gas emissions from expanded natural gas push the global concentrations of atmospheric GHGs beyond what is consistent with safe climate stabilization?

The global concentration of carbon monoxide at approximately 18,000 feet (5,500 meters) altitude, as measured in hectopascals (a measurement of barometric pressure), from October 26 to 28, 2015.

Since 1994 the global concentration of CO2 has increased at an average of 2 % per year; it now stands at 398 parts per million.

Before the industrial revolution began in around 1850, the global concentration stood at 280 parts per million CO2.

But at the same time, global concentrations of methane (blue line in the top chart) have risen.

Adams, P.J., J.H. Seinfeld, and D.M. Koch, 1999: Global concentrations of tropospheric sulfate, nitrate, and ammonium aerosol simulated in a general circulation model.

''... there is medium evidence and high agreement that the cosmic ray - ionization mechanism is too weak to influence global concentrations of [cloud condensation nuclei] or their change over the last century or during a solar cycle in any climatically significant way.»