Displaying items by tag: climate change

Washington Post: Devastating Middle Tennessee floods latest consequence of climate change

Training thunderstorms dumped 17 inches of rain within 24 hours last week in Middle Tennessee, causing a cascade of runoff that led to localized flash flooding of creeks and rivers that killed at least 20 people and destroyed the small town of Waverly. That amount of rain, which a climatologist said had a 1 in 1,000 chance of occurring, would set a record for the highest amount of daily rainfall recorded in the entire state.

A lesser-noted flood of the Pigeon River just over the state line in Haywood County, North Carolina a week ago killed at least five people and destroyed homes and property as the remnants of Tropical Storm Fred moved over the region. The towns of Canton and Clyde were particularly hard hit. A rain gauge in Cruso recorded nearly 15 inches of rain in less than three days, according to the Smoky Mountain News. Nine inches fell within a 24-hour period.

Deadly floods in Germany and the European lowcountry this summer that killed 200 people were also attributed to climate change.

A warmer atmosphere holds exponentially more moisture, so such intense rainstorms will increase in coming years as climate change reshapes the Earth, scientists told the Washington Post.

"It’s yet another example of how climate change has loaded the dice for disaster, experts say. The floods that people lived through in the past are no match for the events that are happening today. And what in 2021 seems like an unprecedented catastrophe may by 2050 become an annual occurrence," the Post reported.

The flooding threat promised by a warming planet is exacerbated by continuing urbanization and inadequate public stormwater infrastructure. More impermeable surfaces means more runoff.

Looking for something to do after work? Want to be part of a rising movement urging TVA to move away from fossil fuels in the face of the global climate crisis? Support transparency from the largest public utility in the country?

The Southern Alliance for Clean Energy, Appalachian Voices, Center for Biological Diversity, the Sunrise Movement, Sierra Club, and other local organizations are hosting a clean-energy rally from 6 p.m. to 7:30 p.m. today (Aug. 18) on Market Square near TVA’s headquarters in downtown Knoxville.

TVA hasn’t had a public listening session in over a year, according to rally organizers. Rally participants will demand that TVA: 

-Restore public listening and input sessions;

-Commit to 100 percent clean energy by 2030;

-Not build new fossil gas plants;

-Protect coal ash workers, and; 

-Dispose of coal ash properly with public health and safety as the utmost priority. 

The rally will feature songs from local musicians, a reading of demands for TVA, speakers discussing pressing issues for TVA and our region, and a short march around Market Square. 

Masks and social distancing are encouraged. For those unable to attend in person, a virtual option is available at Tennessee Valley Energy Democracy Movement Facebook page.

Washington Post: Carbon dioxide levels at highest point in 2 million years

A United Nations climate report authored by 34 people mining 14,000 scientific studies concludes that substantial climate change and its effects are now largely unavoidable but nations, municipalities and individuals can still take steps to minimize the consequences as much as possible.

Here are some key points from the Intergovernmental Panel on Climate Change report:

— Human-caused global climate change is an irrefutable fact. Now the debate is what we do about it.

— Few if any signatories to the 2015 Paris Climate Accord met their pledged reduction targets.

— At current emissions rates, the Earth will have heated to or beyond 2.7 degrees (F) above pre-industrial levels by the 2030s.

— Hurricanes, cyclones, droughts, heat waves and other weather anomalies will worsen.

The report comes as many present disasters linked to global warming unfold around the world. The second-largest wildfire in California history burned in the drought-stricken state; Greece dealt with historic wildfires; and Germany and the European Lowcountry reeled from an unprecedented rainstorm that destroyed entire towns and killed more than 200 people. Another heat wave is supposed to arrive in the Pacific Northwest this week.

As Hellbender Press reported in April, the Tennessee Valley Authority plans to phase out its use of coal. And as we mentioned in an action alert, TVA is conducting a scoping process pertaining to the preparation of an Environmental Impact Statement (EIS) for retirement and replacement of the Kingston Fossil Plant. TVA is preparing similar EIS for its other remaining coal-fired power plants as well.

Although TVA lists "construction and operation of solar and storage facilities" in these scoping documents as an alternative for replacement of coal as the power source, it has made no secret of its belief that construction of gas-powered combustion turbines (CT) and natural gas pipelines to feed them will be the best solution to replace the outdated generation capacity.

Unlike other power utilities, TVA has been making it more difficult, financially unattractive or impossible for distributed renewable energy, storage and even efficiency projects to get realized, according to proponents of renewables and some of TVA’s local power distribution partners. TVA also reneged on its agreement with other utilities to make large amounts of wind power available to the Southeastern United States through the Plains & Eastern Clean Line high-voltage direct-current power line project.

Washington Post: Sea level rise will be investigated as one possible factor in Florida condo collapse

There is no direct evidence yet that increased subsidence on a Florida barrier island caused by rising sea levels and saltwater intrusion contributed to the devastating collapse of an ocean-front condo complex near Miami, but the possibility will be examined in coming weeks and months.

Rising sea levels threaten seaside properties on an increasing scale, undermining the unstable land on which they sit and further contributing to erosion of steel and concrete.

In the case of Champlain Towers South, developers used fill from denuded mangrove stands to support the 12-story building, which was built in 1981.

“Land subsidence is a gradual settling or sudden sinking of the surface when material that supports it is displaced or removed, according to the U.S. Geological Survey. Erosion and the disappearance of groundwater are two of several factors that cause it,” the Washington Post reported.

A least one engineer has said the collapse could be related to a structural problem, not subsidence. The investigation continues, as does the search for bodies.

Global Optimism: “We Have to Be At War With Carbon”

The first 15 minutes of this podcast analyze the Shortcomings of the G7 Summit.

The second 15-minute segment is a conversation with the CEO of Rolls Royce about its goal to make long-distance flights Net Zero by 2050.

NYT: Interactive maps show how the most widespread drought in 20 years is ravaging the Southwest

Low snowpacks, unusually high temperatures and below-normal rainfall have all contributed to the renewed development of extreme and exceptional drought in many portions of the Southwest and California.

Scientists and public officials attribute the drought to climate change. Climatologists expect the drought to worsen during the upcoming summer months and lead to increased wildfires and other problems. Agriculture in California has been particularly affected, and water restrictions to preserve endangered fish are again in a harsh spotlight.  

Drought conditions had lessened since a severe drought affected the region five years ago and led to aggressive rationing and water-conservation measures, but this prolonged dry spell could be even worse.

Lake Mead, the largest reservoir in the U.S., is at its lowest level in 85 years and is emblematic of the growing crisis.

"The lake, which sits on the border between Nevada and Arizona, is under growing pressure from the prolonged drought, climate change and growing population in the Southwest," The Times reported.

Washington Post: CO₂ levels hit highest point yet, even after 15-month idling of transportation, industry and overall carbon emissions.

Initial air pollution reductions during the Covid-19 pandemic had an immediate measurable impact on global and local air quality. Demand for oil dropped by nearly 9 percent. That didn't stop the atmospheric carbon dioxide level from reaching its highest concentration since records began.

It's a sign of how difficult it will be to curb overall global emissions enough to prevent the worst consequences of climate change and global warming.

"Even as international borders closed and global economic activity took a massive hit throughout much of 2020, researchers have found that human-caused emissions rebounded fairly quickly after decreasing sharply early in the pandemic," the Washington Post reported. 

NYT: Shareholder revolt forces troubled Exxon to focus on a fossil-free future

Exxon stock tanked (it was even kicked off the Dow Jones Industrial Average) in recent years, largely because of the oil giant's dismissive stance toward climate change and renewables. This led shareholders to conclude the oil giant wasn't playing the long game by investing in carbon-free fuel technologies.

Both a renegade hedge fund and huge investor groups recently forced a change by electing half a slate to the board of directors who are calling for increased energy-source diversification. Some of the largest pension-investment groups in the country drove the change because Exxon's coddling of climate denialists was definitely and demonstrably bad for business.

NYT: NOAA map details U.S. climate change over last century

The map produced by the National Oceanic and Atmospheric Administration shows that virtually all of the U.S. has higher average temperatures than 100 years ago. The precipitation data shows where rainfall averages have increased (East Tennessee and most of the Appalachian Mountains and their adjacent foothills and valleys) and where they fluctuated beyond average (California and the Southwest). Some of the data predates the regular government weather and climate record-keeping that began 90 years ago.

"Because the normals have been produced since 1930, they also say a lot about the weather over a much longer term. That is, they show how the climate has changed in the United States, as it has across the world, as a result of emissions of heat-trapping gases over more than a century."

CBS News: Eye on Earth

This outstanding video summary by meteorologist and climate specialist Jeff Berardelli explains why scientists fear further deforestation of the Amazon or collapse of Antarctic ice shelves would wreak ultimate havoc in coastal areas around the world.

Students listen to a presentation from an Oak Ridge National Laboratory researcher during National Environmental Education Week.  Courtesy Oak Ridge National Laboratory

Scientists link research to students’ lives and communities

(Editor’s note: Karen Dunlap is a public information officer at Oak Ridge National Laboratory). 

Esther Parish is one of eight Oak Ridge National Laboratory scientists talking to students in nine schools across East Tennessee as part of National Environmental Education Week.

On Monday, she spoke to Cathy Kimball’s fifth-grade class at Lenoir City Middle School.

The discussion covered renewable energy resources, science career paths and how climate change may affect East Tennessee.

Other ORNL scientists, including Debjani Singh, Liz Agee, Shelaine Curd, Spencer Washburn, Colleen Iversen, Keith Kline and Matthew Langholtz are participating in classroom events through April 30.

The national event is organized by the National Environmental Education Foundation (NEEF), which celebrates environmental education.

“I think it is important to reach out to young people about environmental science because the choices that our society makes regarding renewable energy resource development and climate-change mitigation will have long-term effects on their environment, health and future quality of life,” Parish said. She is a member of ORNL’s Environmental Science Division and specializes in geography and landscape ecology.

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News Sentinel: Biden poised to name four new TVA board members

Georgiana Vines has a good overview of the changing of the guard at TVA as Biden takes the reins on the giant public utility. 

Environmental groups are hopeful that new appointees could steer TVA toward more sustainable energy sources and put a focus on the role of power production in climate change.