Carbon dioxide levels dating far back
In the northern fall, winter and early spring, plants and soils give off CONOAA."Carbon dioxide levels in atmosphere hit record high in May: Monthly average surpassed 414 ppm at NOAA's Mauna Loa Observatory in Hawaii." Science Daily. New evidence shows that ancient farming practices led to a rise in the atmospheric emission of the heat-trapping gases carbon dioxide and methane -- a rise that has continued since, unlike the trend ...
The early years at Mauna Loa saw annual increases averaging about 0.7 ppm per year, increasing to about 1.6 ppm per year in the 1980s and 1.5 ppm per year in the 1990s.
The planet has undergone cyclic ice ages for millions of years, but about 850,000 years ago, the cycles of ice grew longer and more intense—a shift that some scientists have attributed to falling CO did not change much over the past 20 million years, but the resolution wasn't high enough to be definitive," said Hönisch.
"This study tells us that CO2 was not the main trigger, though our data continues to suggest that greenhouse gases and global climate are intimately linked." The timing of the ice ages is believed to be controlled mainly by the earth's orbit and tilt, which determines how much sunlight falls on each hemisphere.
Researchers have reconstructed atmospheric carbon dioxide levels over the past 2.1 million years in the sharpest detail yet, shedding new light on its role in the earth's cycles of cooling and warming.
as the cause for earth's ice ages growing longer and more intense some 850,000 years ago.
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The measurement is the highest seasonal peak recorded in 61 years of observations on top of Hawaii's largest volcano and the seventh consecutive year of steep global increases in concentrations of carbon dioxide (CO), according to data published today by NOAA and Scripps Institution of Oceanography.