No rise in CO2 in air for past 150 years

The airborne fraction of carbon dioxide (CO2) has not increased either during the past 150 years or during the most recent five decades, research says.

That the fraction is increasing has been one of the key assumptions in atmospheric models that show increased man-made carbon emissions causing drastic changes in the earth's climate.

Most of the CO2 emitted by human activity is absorbed by the oceans and our ecosystems. In fact, only about 45 per cent of emitted CO2 stays in the air, says the new study.

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