Sentences with phrase «emitted by human»

Greenhouse gases emitted by human activity don't just affect the atmosphere; they also have a negative impact on the world's oceans.

Although natural variations in the solar output can explain most of the temperature variations over the past centuries, it appears that global warming by heat - trapping gases, emitted by human activity, is required to explain the sharp rise in global temperatures during the 1990s.

It is simply ludicrous to pretend that the amounts of CO2 emitted by human activity are insignificant: the rise in atmospheric CO2 has been copiously documented, and is known to be caused by human activity: fossil fuel use, deforestation and land use change.

For instance, Bond et al. report that black carbon aerosol, or soot, is second only to carbon dioxide as the substance emitted by human activity that has the greatest warming influence on the climate — contributing a quarter (or perhaps even a bit more) to the current overall anthropogenic warming effect.

But these 139 nations account for perhaps 99 % of all the carbon dioxide emitted by human combustion of fossil fuels.

Carbon dioxide is emitted by human activities as well as a host of natural processes.

James Hansen, director of NASA's Goddard Institute for Space Studies in New York, today published a study showing that greenhouse gases emitted by human activities have brought the Earth's climate close to critical tipping points, with potentially dangerous consequences for the planet.

The concentration of carbon dioxide in the atmosphere correlates closely — but not perfectly — with the amount of carbon pollution emitted by human activities.

The letter states: «Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver.

Ozone - depleting substances are emitted by human activity at the planet's surface and eventually travel to the stratosphere, where there the chlorine atoms and certain other constituent parts break apart the three oxygen atoms that make up an ozone molecule.

CO2 is the most important greenhouse gas emitted by human activity»

But the sector is also responsible for the emissions that come from the use of their products — in total, around 44 percent emitted by human activity in the United States.

I can readily accept that CO2 absorbs and re-radiates IR under laboratory conditions, that it is emitted by human activity and that its concentration in the atmosphere has increased since measurements started at Mauna Loa.

The rise in greenhouse gases corresponds with the extra amount of CO2 known to have been emitted by human activities, such as burning fossil fuels and cutting down forests.

In addition, the CO2 emitted by human activities has caused an increase of ocean acidity, with poorly understood but potentially important negative impacts.

About a quarter of the carbon dioxide emitted by human activity is taken up by the world's oceans.

The value at the end of Barack Obama's presidency was set at roughly $ 40 for each ton of carbon dioxide, the main greenhouse gas emitted by human activities, or equivalent amounts of other gases such as methane.

Rigorous scientific research concludes that the CO2 emitted by human activities is the primary driver of a profoundly beneficial greening of our planet from its boost to life giving photosynthesis.

Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research concludes that the greenhouse gases emitted by human activities are the primary driver.

The latest report confirms that there is unequivocal evidence for a warming world, largely caused by greenhouse gases emitted by human activities.

Permanently frozen soils worldwide contain 1400 - 1700 Gigatons of carbon, about four times more than all the carbon emitted by human activity in modern times.

The scientists find much merit in pursuing further research on both, but only see practical prospects for capturing and storing carbon dioxide, the main greenhouse gas emitted by human activities.

She asked him to explain his dissent in the 2007 case in which the Supreme Court ruled that the Environmental Protection Agency had the authority to regulate carbon dioxide, the main greenhouse gas emitted by human activities, as a pollutant under the Clean Air Act.

Some almost imperceptible measure of that is carbon emitted by human activities.

«Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research concludes that the greenhouse gases emitted by human activities are the primary driver,» the letter states.

Over a long enough period of time, the increased carbon burial could help offset a small fraction of carbon emitted by human activities such as fossil fuel burning, says study coauthor Antje

When carbon is emitted by human activities into the atmosphere it is generally thought that about half remains in the atmosphere and the remainder is stored in the oceans and on land.

According to the latest report from the Global Carbon Project, a group of scientists who track the amount of carbon emitted by human activity, 2017 will see a 2 percent increase in the burning of fossil fuels, after nearly no growth in 2014, 2015 or 2016.

Our homes and offices account for more than one third of all greenhouse gases emitted by human activity — the bulk of it for heating in winter and air - conditioning in summer, according to the U.N. Intergovernmental Panel on Climate Change (IPCC).

After all, coal burning is responsible for 40 percent of the 30 billion metric tons of CO2 emitted by human activity every year.

Sulfate is emitted by human activities in addition to natural emissions such as volcanoes.

But the Southern Ocean plays a more benign role in the global carbon budget: Its waters now take up about 50 % of the atmospheric carbon dioxide emitted by human activities, thanks in large part to the so - called «biological pump.»

Krotkov and his team now are able to more accurately detect smaller sulfur dioxide concentrations, including those emitted by human - made sources such as oil - related activities and medium - size power plants.

In the late 1800s claims of «magnetic effluvia» and «vital rays» emitted by the human body were encouraged by early photographic images like this one.

One - third of carbon dioxide emitted by humans enters the oceans, making seawater more acidic, the study noted.

Nitrous oxide, produced by the bacterial breakdown of nitrogen, is now the dominant ozone - depleting substance emitted by humans, a new study shows

While El Niño played a role in bumping up global temperatures during 2015 and 2016, the bulk of the warmth was due to the excess heat trapped by greenhouse gases emitted by humans over the past century, particularly carbon dioxide.

The EPA estimates that methane accounts for about 9 percent of greenhouse gas emissions in the U.S. Landfills are the third - largest source of methane emitted by humans in the U.S. behind oil and gas production, and livestock.

Accordingly, all of this is within natural variables, to be expected, etc... The only difference now is that we are well - populated with AGW «enthusiasts» who have such a stake in this movement or theology that everything that happens anywhere must be blamed upon carbon emitted by humans, even absent any evidence to support this.

Geologist Ian Plimer has estimated this to be greater than the amount emitted by humans, although this estimate is controversial.

Since the amounts absorbed or emitted by plant photosynthesis and animal respiration are an order of magnitude greater than those emitted by humans, it is clear that a slight shift in either of these could represent a major shift in the balance.

On a year - to - year basis there does not appear to be any direct correlation between human CO2 emissions and CO2 concentration: the annual increase in CO2 varies between 15 % and 90 % of the CO2 emitted by humans.

The amount of CO2 added to our atmosphere by terrestrial volcanoes is estimated to represent only a small fraction of that emitted by humans, but the total amount entering our climate system via the ocean from submarine volcanoes and fissures in the Earth's crust is unknown.

Since plant photosynthesis absorbs around 15 times as much CO2 as is emitted by humans, once can see that a slight increase in photosynthesis resulting from higher concentrations could well absorb a significant portion of the human emission.

Seems like Hoskins confused fossil fuel contributions with total anthropogenic contributions, 40 % with 64 %, and a source saying more than twice the total increase had been emitted by humans with one that said less than half.

The amount of CO2 absorbed by soils is also much larger than that emitted by humans, and it is not clear how this will change with higher atmospheric CO2 levels.

The mass balance is a very solid argument, as what is emitted by humans doesn't disappear by magic and is added to the atmosphere, even if one second later some of the human CO2 is absorbed by plants or by the oceans, that is at the cost of natural CO2 which should have been used instead.

«as what is emitted by humans doesn't disappear by magic and is added to the atmosphere, even if one second later some of the human CO2 is absorbed by plants or by the oceans, that is at the cost of natural CO2 which should have been used instead.»

You also ignored a key constraint on the amount of CO2 emitted by humans, i.e. the amount of carbon contained in all the remaining fossil fuels on Earth.

To save you the trouble of checking out the slight decline since the 1950s in the percentage of CO2 emitted by humans that «remains» in the atmosphere, I've plotted the data.