Satellite view of swirling blue phytoplankton bloom in the Black Sea. (Photo: Stocktrek Images/Getty Images)
A new study finds that unabated greenhouse gas emissions will cripple ocean phytoplankton’s ability to produce oxygen.
As representatives from 195 nations gather in Paris to hammer out a global agreement to slash greenhouse gas emissions, a new study finds that the failure to do so could leave the world gasping for breath.
If the world’s oceans warmed by 6 degrees Celsius—a realistic possibility if global emissions continue unabated—the tiny plants would halt oxygen production, according to the study, which was published Tuesday in the Bulletin of Mathematical Biology.
By 2100, the earth at sea level could have atmospheric oxygen levels comparable to the top of Mount Everest today. “And as far as I know, people cannot normally stay on Everest without oxygen masks for more than a few minutes,” Petrovskii said.
The threat has been “mostly overlooked” by climate scientists, Petrovskii said, noting that such a global disaster would come with little notice.
“A distinct feature of this catastrophe is that there will be few warning signs and little change before it is too late,” he said. That’s because phytoplankton can continue to produce oxygen and photosynthesize at levels below 6 degrees of temperature rise.
“Under a 2-degree increase, we will probably see no change; the 4-degree increase would already be dangerously close,” Petrovskii said, adding that more research is needed to determine what increase in global temperatures would halt phytoplankton’s ability to photosynthesize.
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