Sentences with phrase «of atmospheric carbon»

Climate change driven by increasing levels of atmospheric carbon dioxide will not.

About 6000 years ago, levels of atmospheric carbon dioxide rose — and until now slash - and - burn by the 12 million humans on the planet at the time has been blamed.

The chemistry of the ocean is also affected, as the increased concentrations of atmospheric carbon dioxide will cause the ocean to become more acidic.

Nonetheless mature forests do play an important role in the global carbon cycle as stable carbon pools, and clearance of forests leads to an increase of atmospheric carbon dioxide levels.

During these sixty - one years the amount of atmospheric carbon dioxide increased by slightly over twenty percent.

By far the best match was to the record of atmospheric carbon dioxide, measured from atmospheric samples and air trapped in polar ice.

Long - term climate change fueled by a buildup of atmospheric carbon emissions is a controversial notion politically, but it's one accepted as fact by most scientists.

Each part per million of CO2 corresponds to about 2.1 billion tonnes of atmospheric carbon.

Detailed measurements of atmospheric carbon dioxide (CO2) levels have been taken continuously for more than 50 years.

Another clear benefit is that artificial photosynthesis could help absorb a large chunk of atmospheric carbon emissions.

Historical temperature time series and series of atmospheric carbon dioxide measurements show clearly how climate has changed over the past 100 years.

Since the industrial revolution, human beings burning fossil fuels have boosted concentrations of atmospheric carbon more than 30 percent, disrupting the ancient cycle.

Despite their limited size, these areas are considered to be important sinks of atmospheric carbon dioxide, arguably with relevance for global climate.

Like sugar, to be made of atmospheric carbon dioxide & water, releasing molecular oxygen and nothing else.

This can have a direct effect on the amount of atmospheric carbon incorporated into the soil.

We have no idea, for example, how much of the atmospheric carbon being absorbed by the surface of the oceans reaches the bottom, nor how long that takes.

He was already deeply concerned about the consequences of atmospheric carbon and saw the opportunity as an «all hands on deck» approach to heading off an environmental disaster.

Scientists have found signals of atmospheric carbon from hundreds of millions of years ago.

The need for countries to make more ambitious emissions - reduction commitments remains self - evident — even more so, now that the world has exceeded 400 ppm of atmospheric carbon dioxide.

The next uncertainty is embedded in the response of the natural world to ever - higher ratios of atmospheric carbon.

Maybe scientists will conclude that this really is the fault of that atmospheric carbon.

They measured evidence of atmospheric carbon dioxide, trapped in ancient ice cores, and found a lower limit.

The 800,000 year history of atmospheric carbon dioxide concentrations, showing the huge spike in the past century.

Indeed, the team estimates that this cooling effect could reduce by two - thirds the predicted increase in global temperatures initiated by a doubling of atmospheric carbon dioxide.

Information gathered may help project how reefs will stand up to rising sea temperatures and increasing acidification, both caused by rising levels of atmospheric carbon dioxide.

Now the record of atmospheric carbon dioxide and methane concentrations has been extended by two more complete glacial cycles to 800,000 years ago.

This calculation determines how much global temperatures will change as atmospheric carbon dioxide continues to increase — at about 1 percent per year — until the total amount of atmospheric carbon dioxide has doubled.

They wrote of a 25 % increase of atmospheric carbon dioxide by the year 2000.

«A limit to the availability of iron in this region means that the ocean is less efficient in its uptake of atmospheric carbon dioxide,» he said.

Historically, the soil carbon pool has been a major source of atmospheric carbon dioxide with likely more than 80 GtC lost from grazing and cropping lands.

And the effects of atmospheric carbon dioxide as a fertilizer of plant growth are at least as important as its effects on climate.»

The event commemorates the 5 November 1965 President's Council of Advisors on Science and Technology (PCAST) report to President Lyndon B. Johnson, which warned that the accumulation of atmospheric carbon dioxide from the burning of fossil fuels would «almost certainly cause significant changes» to the environment.

The study shows that satellite observations of atmospheric carbon dioxide levels are a useful tool toward understanding how semiarid ecosystems will respond to climate change in the future.

The researchers discovered a temperature increase of just 1 degree Celsius in near - surface air temperatures in the tropics leads to an average annual growth rate of atmospheric carbon dioxide equivalent to one - third of the annual global emissions from combustion of fossil fuels and deforestation combined.

The annual growth of atmospheric carbon dioxide (CO2) during 2015, above three parts per million (ppm) per year, was the largest ever recorded at the Mauna Loa Observatory in Hawaii, said climate researchers Wednesday.

But it is possible to return most of the atmospheric carbon increase to vegetation and soils in ways that improve agricultural productivity, enhance food security, conserve biodiversity and create more flood and drought tolerant food production systems.

Note that the most optimistic curve DEP 2.6 has emissions that drop to zero from 2020 to 2070 and, following that, net human sequestration of atmospheric carbon.

These range from stabilization of atmospheric carbon dioxide at twice its pre-industrial value by the end of this century (IPCC SRES B1) to continuously increasing atmospheric carbon dioxide at the rate of a bit less than 1 % per year (IPCC SRES A2).

Operations at AAAS release much less carbon dioxide into the atmosphere — 1518 fewer tons of atmospheric carbon dioxide per year as of 2008 — compared with the industry standard for a similar building, according to data available through the U.S. Environmental Protection Agency's Energy Star program.

«They tell us the story of the chemical and isotopic compositions of the atmospheric carbon dioxide.»

In this group activity, students assess a series of facts to understand how to manage a plantation forests to maximize the removal of atmospheric carbon as they practice cooperative learning and graph interpretation skills.

The transient climate response is the change in the global surface temperature, averaged over a 20 - year period, centered at the time of atmospheric carbon dioxide doubling, that is, at year 70 in a 1 % yr - 1 compound carbon dioxide increase experiment with a global coupled climate model.