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Could the 'Mangrove Effect' Save Coasts From Sea Level Rise?

Mangroves growing near NASA's Kennedy Space Center could help protect it from rising sea levels. NASA / Glenn Benson

When it comes to climate change and sea level rise, the news has been generally bad for communities on the U.S. Southeast coast.

Florida is set to lose more than 10 percent of its homes by 2100, and five southern states have already lost $7.4 billion in home values.


But one study conducted by biologists at Villanova University offered some hope for the beleaguered region: warmer temperatures encourage the growth of mangroves, which have more complex roots than other wetland plants and can help build soil and protect coasts from storms like hurricanes.

"The study links the growth of individual plants, and particularly their roots, to the survival of an entire ecosystem. The long-term strength of the mangrove effects we identified may determine what the maps of our southeastern coastlines look like in the future," study author and Villanova biologist J. Adam Langley said in a university press release.

The study, published in the British Ecological Society's Journal of Ecology Tuesday, conducted a two-year experiment in a mixed salt marsh and mangrove wetland at Kennedy Space Center (KSC) in the Merritt Island National Wildlife Refuge (MINWR) on Merritt Island, Florida.

The researchers exposed both salt marshes and mangroves to warming chambers and found that higher temperatures doubled the plants' height and increased the transition from salt marsh to mangrove ecosystems.

Plots exposed to warming saw their mangrove cover increase by a factor of six compared with plots left at current temperatures.

Further, the mangroves' elevation increased when exposed to temperatures consistent with projections for future warming, indicating that trees would be able to build soil to keep pace with a rise in sea level.

The expansion of mangroves at KSC could have immediate practical benefits, since National Aeronautics and Space Administration (NASA), which provided funding for the study, relies on wetlands and sand dunes to protect its $5.6 billion worth of infrastructure at the center.

However, as warming temperatures expand the range of mangroves, the study's implications could move beyond the Southeast.

"This mangrove effect could benefit coastal wetlands around the world," Langley said.

It also indicates that some changes caused by climate change could help combat others, if we conserve the ecosystems where those beneficial changes occur.

"Our study provides some evidence that the ongoing reshuffling of species on earth's surface could allow for some adaptation to the same global changes that are causing them," Villanova biologist Samantha K. Chapman said. "Conserving and restoring our coastal wetlands can help humans adapt to climate change."

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A second U.S. jury has ruled that Roundup causes cancer.

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"We are disappointed with the jury's initial decision, but we continue to believe firmly that the science confirms glyphosate-based herbicides do not cause cancer," Bayer spokesman Dan Childs said in a statement reported by The Guardian. "We are confident the evidence in phase two will show that Monsanto's conduct has been appropriate and the company should not be liable for Mr. Hardeman's cancer."

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"Although the evidence that Roundup causes cancer is quite equivocal, there is strong evidence from which a jury could conclude that Monsanto does not particularly care whether its product is in fact giving people cancer, focusing instead on manipulating public opinion and undermining anyone who raises genuine and legitimate concerns about the issue," he said.

Many regulatory bodies, including the U.S. Environmental Protection Agency, have ruled that glyphosate is safe for humans, but the World Health Organization's International Agency for Research on Cancer found it was "probably carcinogenic to humans" in 2015. A university study earlier this year found that glyphosate use increased cancer risk by as much as 41 percent.

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University of Richmond law professor Carl Tobias told Reuters that Tuesday's decision showed that the verdict in Johnson's case was not "an aberration," and could possibly predict how future juries in the thousands of pending cases would respond.


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