Agriculture

Published on May 23rd, 2010 | by Susan Kraemer

2

Climate Change to Rob Your Grandchildren of Nutrients in Pies, Bread, Pizza or Spaghetti

May 23rd, 2010 by  

Scientists testing how crops react in higher CO2 conditions than now – simulating conditions likely over the next 50 years, say that one effect will likely be that protein content will be reduced by one fifth. Plants lose the ability to absorb as much nitrogen in higher CO2 conditions. Most plants use nitrate as the most common form of nitrogen and convert it to protein.

Arnold Bloom, lead author of the UC Davis study, published in the May 14th issue of Science said that when they  increased the levels of CO2 in the test to the levels scientists predict over the next 50 years, it led to “nitrogen starved” crops that contained 20% less protein for human consumption.

“Wheat grain that has been exposed to the conditions that we expect in the next few decades declines about 20 per cent,” he said.

Researchers have long known that initially, at least, higher CO2 in the atmosphere leads to improved crop productivity, but that plants eventually acclimatise to higher CO2 levels and cease to thrive as levels rise higher.

Until now, there has been no hypotheses for why this happens. Now Blooms study suggests that the inhibition of nitrate assimilation may be the reason why plants do not thrive in ever-increasing CO2-rich environments as expected.

Increasing the amount of nitrates in fertilizer did not counteract the problem. An alternative is needed, and ammonium was tested as a replacement. Those plants exposed to nitrate had difficulty in producing nitrogen-containing compounds like proteins, while those exposed to ammonium did not.

Marta Lopes, a wheat physiologist at the International Maize and Wheat Improvement Center, Mexico, warns that care would need to be taken to avoid its toxic effects on the environment.

Related stories:

California to Lose Crops to Climate Change

Up to 82% Drop in Corn, Soy by Century’s End

We Learn to Grow Crops in Saltwater

We Might Still Have Food in the Future After All

Image: The Good Old Days

Source: SciDev


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About the Author

writes at CleanTechnica, CSP-Today and Renewable Energy World.  She has also been published at Wind Energy Update, Solar Plaza, Earthtechling PV-Insider , and GreenProphet, Ecoseed, NRDC OnEarth, MatterNetwork, Celsius, EnergyNow, and Scientific American. As a former serial entrepreneur in product design, Susan brings an innovator's perspective on inventing a carbon-constrained civilization: If necessity is the mother of invention, solving climate change is the mother of all necessities! As a lover of history and sci-fi, she enjoys chronicling the strange future we are creating in these interesting times.    Follow Susan on Twitter @dotcommodity.



  • Mary Genoud

    It’s time we add sustainability to policies.

    Climate impacts will affect agriculture, therefore our food. No rain, definately a problem, and regions with too much rain actually can have crops with the same result, no harvest.

    I remember 3-4 years ago, there was a rain storm in Provance,France over several days at harvest time, 3/4s of the vegetable and fruit harvest was destroyed.

    climate change, and its impacts. We all need to better understand this phenomina.

  • Jess

    No link to the study or report?

    [SK: Added a link to the original abstract at Science as well – but it costs money to access the full report]

    How would this be much different than the way they’ve been using CO2 generators in greenhouses?

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