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News Release 14-152
Boosts in productivity of corn and other crops modify Northern Hemisphere carbon dioxide cycle
Croplands help drive greater seasonal change in annual cycle
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![combines harvesting](/news/mmg/media/images/CombineHarvesters_f.jpg)
Humans and our croplands are important newcomers to the atmospheric carbon dioxide cycle story.
Credit: Thinkstock
![irrigation syste, on the field](/news/mmg/media/images/Irrigation_f.jpg)
Interactions between Northern Hemisphere agriculture and Earth's atmosphere may be far-reaching.
Credit: Thinkstock
![wheat](/news/mmg/media/images/GauzyWheat_f.jpg)
Changes in Northern Hemisphere atmospheric carbon dioxide levels may be linked with agriculture.
Credit: Wikimedia Commons
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![corn field at sunset](/news/mmg/media/images/CornFieldSunset_f.jpg)
During the last 50 years, cropland area has been stable, but production has intensified.
Credit: James Jordan/Wikimedia Commons
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![Corn plants in the field](/news/mmg/media/images/sunnycorn_f_c127744b-b3b2-460a-9c48-077c398197a1.jpg)
Corn accounts for two-thirds of the crop contribution to changes in seasonal carbon dioxide.
Credit: Lars Plougmann/Wikimedia Commons
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![tractor in the field](/news/mmg/media/images/CornSilageMountain_f.jpg)
Almost 90 percent of the Northern Hemisphere's corn is produced in the U.S. and China.
Credit: Jess Johnson/Wikimedia Commons
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