Louisiana Flood 'Worst Natural Disaster' Since Hurricane Sandy, Red Cross Says
By Kevin Kalhoefer
The major U.S. broadcast news networks have all ignored climate change in their nightly news coverage of Louisiana's recent record-breaking rainfall and flooding. The New York Times and The Washington Post, by contrast, have explained how the extreme weather and flooding in Louisiana are in line with the predicted impacts of a warming planet.
The disaster in Louisiana killed at least 11 people and displaced thousands more. The American Red Cross described the state's flooding as "the worst natural disaster to strike the United States since Superstorm Sandy" and the National Oceanic and Atmospheric Association classified the record rainfall as a once-in-every-500-years event—the eighth such event to take place in the U.S. since May 2015.
Climate Nexus' Climate Signals, a tool designed to "[e]xplore how climate change affects your world by searching events, impacts and related climate signals," explained how Louisiana's increased atmospheric moisture and unusually heavy rainfall were "classic signals of climate change":
At least nine people have died in what the American Red Cross is calling the "worst disaster since Superstorm Sandy." On Aug. 11, a measure of atmospheric moisture, precipitable water, was in historic territory at 2.78 inches, a measurement higher than during some past hurricanes in the region. Increased moisture in the air and unusually heavy rainfall are classic signals of climate change. As the world warms, storms are able to feed on warmer ocean waters and the air is able to hold and dump more water. These trends have led to a pronounced increase in intense rainfall events and an increase in flooding risk. In the Southeastern U.S., extreme precipitation has increased 27 percent from 1958 to 2012.
The storm in the Southeastern U.S. was supercharged by running over a warmer ocean and through an atmosphere made wetter by global warming.
Climate change is now responsible for 17 percent of moderate extreme rainfall events, i.e. one-in-a-thousand day events. The more extreme the event, the more likely climate change was responsible, as climate change affects the frequency of the extreme events the most.
However, the major broadcast networks' nightly newscasts have ignored climate change in their otherwise extensive coverage of the floods. NBC Nightly News aired five segments on the floods without mentioning climate change, while ABC's World News Tonight and CBS Evening News each aired three such segments and PBS NewsHour aired two.
By contrast, two major newspapers have noted how Louisiana's deadly floods are in line with expectations for a warming planet. In an Aug. 15 Washington Post article, Chris Mooney wrote that climate researchers were affirming that the heavy rainfall Louisiana experienced is "precisely the sort of event that you'd expect to see more of on a warming planet" and quoted climate researcher Katharine Hayhoe explaining, "Louisiana is always at risk of floods, naturally, but climate change is exacerbating that risk, weighting the dice against us."
Moreover, an Aug. 16 article in The New York Times quoted Texas' state climatologist stating, "There's definitely an increase in heavy rainfall due to climate change." And another Aug. 16 Times article—headlined Flooding in the South Looks a Lot Like Climate Change—quoted David Easterling, a director at the National Centers for Environmental Information, stating that Louisiana's heavy rainfall and flooding "is consistent with what we expect to see in the future if you look at climate models."
Media Matters' annual study of how the major networks cover climate change found that PBS, CBS and NBC frequently addressed the link between climate change and extreme weather in their nightly newscasts in 2015. However, the broadcast networks appear to have regressed in their extreme weather coverage this year, with every major TV network ignoring the role of human-induced climate change in their coverage of Texas' record rainfall and flooding throughout April and May, despite both NBC Nightly News and CBS Evening News explaining the climate connection in their coverage of similarly drastic Texas floods the year before. The nightly newscasts' omission of climate change in their coverage of Louisiana's horrific flooding marks a continuation of that discouraging trend.
UPDATE (8/18/16): After this piece was published, PBS NewsHour aired an Aug. 17 segment with Louisiana state climatologist Barry Keim and Columbia University professor Adam Sobel that discussed how the Louisiana flooding and Blue Cut wildfire in California are "related to climate change."
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By Katherine Kornei
Clear-cutting a forest is relatively easy—just pick a tree and start chopping. But there are benefits to more sophisticated forest management. One technique—which involves repeatedly harvesting smaller trees every 30 or so years but leaving an upper story of larger trees for longer periods (60, 90, or 120 years)—ensures a steady supply of both firewood and construction timber.
A Pattern in the Rings<p>The <a href="https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/coppice-standards-0" target="_blank">coppice-with-standards</a> management practice produces a two-story forest, said <a href="https://www.researchgate.net/profile/Bernhard_Muigg" target="_blank">Bernhard Muigg</a>, a dendrochronologist at the University of Freiburg in Germany. "You have an upper story of single trees that are allowed to grow for several understory generations."</p><p>That arrangement imprints a characteristic tree ring pattern in a forest's upper story trees (the "standards"): thick rings indicative of heavy growth, which show up at regular intervals as the surrounding smaller trees are cut down. "The trees are growing faster," said Muigg. "You can really see it with your naked eye."</p><p>Muigg and his collaborators characterized that <a href="https://ltrr.arizona.edu/about/treerings" target="_blank">dendrochronological pattern</a> in 161 oak trees growing in central Germany, one of the few remaining sites in Europe with actively managed coppice-with-standards forests. They found up to nine cycles of heavy growth in the trees, the oldest of which was planted in 1761. The researchers then turned to a historical data set — more than 2,000 oak <a href="https://eos.org/articles/podcast-discovering-europes-history-through-its-timbers" target="_blank" rel="noopener noreferrer">timbers from buildings and archaeological sites</a> in Germany and France dating from between 300 and 2015 — to look for a similar pattern.</p>
A Gap of 500 Years<p>The team found wood with the characteristic coppice-with-standards tree ring pattern dating to as early as the 6th century. That was a surprise, Muigg and his colleagues concluded, because the first mention of this forest management practice in historical documents occurred only roughly 500 years later, in the 13th century.</p><p>It's probable that forest management practices were not well documented prior to the High Middle Ages (1000–1250), the researchers suggested. "Forests are mainly mentioned in the context of royal hunting interests or donations," said Muigg. Dendrochronological studies are particularly important because they can reveal information not captured by a sparse historical record, he added.</p><p>These results were <a href="https://www.nature.com/articles/s41598-020-78933-8" target="_blank">published in December in <em>Scientific Reports</em></a>.</p><p>"It's nice to see the longevity and the history of coppice-with-standards," said <a href="https://www.teagasc.ie/contact/staff-directory/s/ian-short/" target="_blank">Ian Short</a>, a forestry researcher at Teagasc, the Agriculture and Food Development Authority in Ireland, not involved in the research. This technique is valuable because it promotes conservation and habitat biodiversity, Short said. "In the next 10 or 20 years, I think we'll see more coppice-with-standards coming back into production."</p><p>In the future, Muigg and his collaborators hope to analyze a larger sample of historic timbers to trace how the coppice-with-standards practice spread throughout Europe. It will be interesting to understand where this technique originated and how it propagated, said Muigg, and there are plenty of old pieces of wood waiting to be analyzed. "There [are] tons of dendrochronological data."</p><p><em><a href="mailto:email@example.com" target="_blank" rel="noopener noreferrer">Katherine Kornei</a> is a freelance science journalist covering Earth and space science. Her bylines frequently appear in Eos, Science, and The New York Times. Katherine holds a Ph.D. in astronomy from the University of California, Los Angeles.</em></p><p><em>This story originally appeared in <a href="https://eos.org/articles/tree-rings-reveal-how-ancient-forests-were-managed" target="_blank">Eos</a></em> <em>and is republished here as part of Covering Climate Now, a global journalism collaboration strengthening coverage of the climate story.</em></p>
Earth's ice is melting 57 percent faster than in the 1990s and the world has lost more than 28 trillion tons of ice since 1994, research published Monday in The Cryosphere shows.
By Jewel Fraser
Noreen Nunez lives in a middle-class neighborhood that rises up a hillside in Trinidad's Tunapuna-Piarco region.