Sentences with phrase «high atmospheric carbon dioxide concentrations»

This would then lead to large, unpredictable changes in ocean ecosystem structure and productivity, on top of other large unpredictable changes to be expected from ocean acidification, the other great oceanic consequence of high atmospheric carbon dioxide concentrations from fossil fuel burning.

«They are using this information to test state - of - the - art climate models under conditions of high atmospheric carbon dioxide concentrations, similar to those expected by the end of this century.»

Not exact matches

Record emissions of carbon dioxide mean atmospheric concentrations have reached levels that lead to the highest temperature increases

Although plants grown in high levels of carbon dioxide — say, double the current atmospheric concentrations — initially grow rapidly, the growth tapers off within weeks and the plants wind up with a low protein content.

The atmospheric concentration of carbon dioxide, a critical greenhouse gas, is higher than it has been for at least 650,000 years.

Within that range of atmospheric density, even higher concentrations of carbon dioxide wouldn't have been adequate to counteract the faint young sun, suggesting that methane, ethane or other strong greenhouse gases kept Earth from freezing.

«We find this fingerprint both in a high - resolution climate model in response to increasing atmospheric carbon dioxide concentrations, and in the temperature trends observed since the late nineteenth century.»

The higher concentrations of atmospheric carbon dioxide throughout the PETM decreased the nutritional value of plant material, however, leading to a temporary decrease in the size of some herbivorous insects and mammals.

The impact of higher temperature and marine productivity is evaluated in the model as a result of higher atmospheric carbon dioxide and oceanic nutrient concentrations.

«We find this fingerprint both in a high - resolution climate model in response to increasing atmospheric carbon dioxide concentrations, and in the temperature trends observed since the late nineteenth century.»

Global atmospheric carbon dioxide concentrations have now passed 400 parts per million (ppm), a level that last occurred about 3 million years ago, when both global average temperature and sea level were significantly higher than today.

Victor argues that policymakers should instead focus on a suite of «vital signs» that are more tightly linked to carbon emissions, including atmospheric carbon - dioxide concentrations, ocean heat content, and high - latitude temperature changes.

Global - average atmospheric concentrations of carbon dioxide rose to 389 parts per million in 2010, 39 % higher than at the start of the industrial era in 1750.

When NASAâ $ ™ s James Hansen sounded the alarm in Congress 20 years ago, he predicted that rising concentrations of atmospheric carbon dioxide, or CO2, would drive global temperatures higher by 0.34 degrees Celsius during the 1990s.

Increased weed and pest pressure associated with longer growing seasons and warmer winters will be an increasingly important challenge; there are already examples of earlier arrival and increased populations of some insect pests such as corn earworm.64 Furthermore, many of the most aggressive weeds, such as kudzu, benefit more than crop plants from higher atmospheric carbon dioxide, and become more resistant to herbicide control.72 Many weeds respond better than most cash crops to increasing carbon dioxide concentrations, particularly «invasive» weeds with the so - called C3 photosynthetic pathway, and with rapid and expansive growth patterns, including large allocations of below - ground biomass, such as roots.73 Research also suggests that glyphosate (for example, Roundup), the most widely - used herbicide in the United States, loses its efficacy on weeds grown at the increased carbon dioxide levels likely to occur in the coming decades.74 To date, all weed / crop competition studies where the photosynthetic pathway is the same for both species favor weed growth over crop growth as carbon dioxide is increased.72

Higher temperatures today are largely sustained by increased atmospheric concentrations of greenhouse gases, especially carbon dioxide.

Yesterday it was announced by the World Meteorological Organization (an arm of the United Nations), with front page coverage by the global media, that the atmospheric concentration of carbon dioxide (CO2) last year reached a new high value (396 parts per million, ppm) and got there in record time (2.9 ppm / yr).

This visualization provides a high - resolution, three - dimensional view of global atmospheric carbon dioxide concentrations from September 1, 2014 to August 31, 2015.

At the same time, Dr. Grabherr said, increasing atmospheric carbon dioxide concentrations could theoretically increase plant productivity at high altitudes, leading plants to spread upslope.

The atmospheric concentration of carbon dioxide has increased by more than 30 % since the start of the industrial age and is higher now than at any time in at least the past 650,000 years.

Measured atmospheric concentrations of carbon dioxide are currently 100 ppm higher than pre-industrial levels.

From record - high temperatures to atmospheric concentrations of carbon dioxide not seen in a million years or more to a landmark international agreement to limit global warming, no other year has seen such a stark contrast of climate indicators.

If you write that the atmospheric concentration of carbon dioxide is «widely accepted as being about 350 parts per million», and walk away, it doesn't do much good for me to answer that it is known with high confidence to be between 385 and 390 parts per million (in 2009, on a global annual average).