Sentences with phrase «observed changes in carbon dioxide»

«We estimate that the amount of carbon sequestered in the growing forests was about 10 to 50 percent of the total carbon that would have needed to come out of the atmosphere and oceans at that time to account for the observed changes in carbon dioxide concentrations,» said Richard Nevle, visiting scholar in the Department of Geological and Environmental Sciences at Stanford.

«We estimate that the amount of carbon sequestered in the growing forests was about 10 to 50 percent of the total carbon that would have needed to come out of the atmosphere and oceans at that time to account for the observed changes in carbon dioxide concentrations,» said Nevle, a visiting scholar in the Department of Geological and Environmental Sciences at Stanford.

Not exact matches

To test the role scent played in mosquito behavior, the researchers released a plume of carbon dioxide — the gas we exhale with each breath — into the wind tunnel and observed how mosquito behavior changed.

Both papers found the observed differences in CO2 bands matching the expected changes from rising carbon dioxide levels.

'' -LSB-...][T] here is no substantive basis for predictions of sizeable global warming due to observed increases in minor greenhouse gases such as carbon dioxide, methane and chlorofluorocarbons,» Lindzen told a gathering at the Heartland Institute's International Conference on Climate Change.

Researchers believe such dramatic changes in the carbon dioxide system in surface waters have not been observed for more than 20 million years of Earth history.

In other words, if all of the terrestrial carbon today (in forests, animals, soils, etc.) were converted to carbon dioxide and returned to the global inorganic carbon pool, the change in the global carbon isotopic ratio would only be a third as big as that observed during the PETIn other words, if all of the terrestrial carbon today (in forests, animals, soils, etc.) were converted to carbon dioxide and returned to the global inorganic carbon pool, the change in the global carbon isotopic ratio would only be a third as big as that observed during the PETin forests, animals, soils, etc.) were converted to carbon dioxide and returned to the global inorganic carbon pool, the change in the global carbon isotopic ratio would only be a third as big as that observed during the PETin the global carbon isotopic ratio would only be a third as big as that observed during the PETM!

Both papers found the observed differences in CO2 bands matching the expected changes from rising carbon dioxide levels.

Oil used for transportation and coal used for electricity generation are the largest contributors to the rise in carbon dioxide that is the primary driver of observed changes in climate over recent decades.

Changing distributions of temperature, precipitation, and carbon dioxide could affect the potency of plant allergens, 43 and there has been an observed increase of 13 to 27 days in the ragweed pollen season at latitudes above 44 ° N. 43

Increases in carbon dioxide and other greenhouse gases have almost certainly played a major role in the observed temperature increases of the 20th Century, according to the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report.

Are observed changes in the concentration of carbon dioxide in the atmosphere really dangerous?

The study estimates climate sensitivity — how much the world will warm when carbon dioxide levels increase * — from changes in observed temperatures and estimates of the warming effect of greenhouse gases and other drivers of climate change, from the mid / late 19th century until 2016.

The SAP 3.1 report describes complex mathematical models used to simulate the Earth's climate on some of the most powerful supercomputers, and assesses their ability to reproduce observed climate features, and their sensitivity to changes in conditions such as atmospheric concentrations of carbon dioxide.

«While the benefits of carbon dioxide are proven, the alleged risks of climate change are contrary to observed data, are based on admitted speculation, and lack adequate scientific basis,» the company wrote in the 24 March 2015 letter.

By dividing the total temperature change (as indicated by the best - fit linear trend) by the observed rise in atmospheric carbon dioxide content, and then applying that relationship to a doubling of the carbon dioxide content, Loehle arrives at an estimate of the earth's transient climate sensitivity — transient, in the sense that at the time of CO2 doubling, the earth has yet to reach a state of equilibrium and some warming is still to come.

Greenhouse Theory: Are observed changes in the concentration of carbon dioxide in the atmosphere really dangerous?