Sentences with phrase «atmospheric oxygen decline»

Not exact matches

Curiously, the decline in atmospheric oxygen over the past 800,000 years was not accompanied by any significant increase in the average amount of carbon dioxide in the atmosphere, though carbon dioxide concentrations do vary over individual ice age cycles.

«Ice cores reveal a slow decline in atmospheric oxygen over the last 800,000 years.»

«The prevailing thinking has been that as the oceans warm due to increasing atmospheric greenhouse gases, the oxygen content of the oceans should decline,» Thunell says.

But the evidence shows this can't be true; temperature changes before CO2 in every record of any duration for any time period; CO2 variability does not correlate with temperature at any point in the last 600 million years; atmospheric CO2 levels are currently at the lowest level in that period; in the 20th century most warming occurred before 1940 when human production of CO2 was very small; human production of CO2 increased the most after 1940 but global temperatures declined to 1985; from 2000 global temperatures declined while CO2 levels increased; and any reduction in CO2 threatens plant life, oxygen production, and therefore all life on the planet.

Ralph Keeling, the son of David Keeling (mentioned above), has shown that atmospheric oxygen has declined by roughly 600 parts «per meg» — that is, per million oxygen molecules — since 1990.

We also know that phytoplankton, the base of the oceanic food chain, significantly effects atmospheric oxygen and carbon dioxide levels, despite their decline.

It's not just the isotopic signature, or the decline of atmospheric oxygen concentrations — which is the signature of the source of the CO2 being combustion... It's also this simple mass balance argument.