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A washout is seen along Porters Creek Road in Great Smoky Mountains National Park following torrential rain on July 12. National Park Service

Flooding causes Smokies damage, prompts water advisory for Sevierville 

SEVIERVILLE — Extremely heavy rain on July 12 in the Smoky Mountains caused a cascade of problems now just coming to light.

Sevierville and Sevier County issued a boil-water advisory early Thursday after debris flushed by Tuesday’s floodwaters clogged the city water utility’s main intake on the French Broad River, leading to pressure decreases that opened up lines to possible outside contamination.

In Great Smoky Mountains National Park, Greenbrier campground was closed indefinitely after the swollen Middle Prong of the Little Pigeon River wiped out roads, trails and bridges in the area.

Wild turkeys forage in charred hardwood forest soon after the 2016 Gatlinburg fires, which moved from the Smokies to developed areas in Sevier County. An ORNL model predicts wildfire threats will increase in the Southern Appalachians because of climate change. Thomas Fraser/Hellbender Press via Knoxville Mercury

ORNL report: Local wildfire danger will likely loom larger because of climate change

OAK RIDGE — This cruel summer, the Southern Appalachian region is already baking in above-normal temperatures and basking in poor air quality. 

Air temperatures in Knoxville flirted with 100 degrees on July 6, which were well above average and prompted the National Weather Service to issue a heat advisory for much of the metropolitan area.

It’s hard to definitively link a heat wave to global warming, but one oft-cited consequence of climate change is the growing intensity of wildfires, even in the traditionally moisture-rich Appalachians. The range of climate change effects is difficult to pin down, but one constant in the study of climate change is an expected increase in overall temperatures, which can power wildfires via both fuel increases and volatility.

Bloomberg reports that methane leaks from the natural gas sector may be far worse than estimated by the EPA. While replacing coal-fired power plants with natural gas ones reduces air pollution it may not help at all with climate change because methane is 30 times more effective as a greenhouse gas than CO₂.  Image source: Kayrros SAS

Report: Many utilities are not reducing carbon emissions despite public assurances to the contrary

KNOXVILLE — Global greenhouse gas emissions must peak by 2025 and experience rapid and deep reductions to avoid a potentially catastrophic future, according to a new analysis by air-quality and climate advocates. Emissions must reach net zero by the early 2050s to limit warming to 1.5 degrees (C) in order to avoid the worst impacts of the climate crisis.

Many utilities and municipalities have acknowledged this dynamic, but the Southern Alliance for Clean Energy s fourth annual “Tracking Decarbonization in the Southeast" report highlights that current utility resource plans are not in line with this overarching target. Obstacles to getting utilities on track that are discussed in our report include: increasing reliance on fossil gas, underutilizing energy efficiency, and placing limitations on popular technologies such as rooftop solar. There’s still a lot of work to do before any Southeast utility is on track to decarbonize.

Spreading avens are seen in bloom in the Appalachians. The endangered long-stemmed perennials survive in higher mountain elevations but their lack of space to move higher in elevation in times of climate change and warming further threaten the plant.  USFWS

It’s not just the coastlines that are recording climate change. Even the mountains of North Carolina are feeling the heat — including some endangered plants

“Atlanta reporter Dan Chapman retraced John Muir’s 1867 trek through the South, including the naturalist’s troubling legacy, to reveal environmental damage and loss that’s been largely overlooked.” This is an excerpt published by The Revelator from his book, A Road Running Southward: Following John Muir’s Journey Through an Endangered Land.

BOONE — It’s a wonder anything survives the ice, snow, and winds that pummel the ridge, let alone the delicate-seeming yellow flowers known as spreading avens.

The lovely, long-stemmed perennials are exceedingly rare, officially listed as endangered, and found only in the intemperate highlands of North Carolina and Tennessee. They sprout from shallow acidic soils underlying craggy rock faces and grassy heath balds. At times blasted with full sun, but mostly shrouded in mist, the avens are survivors, Ice Age throwbacks that refuse to die. Geum radiatum is only known to exist in fourteen places, including hard-to-find alpine redoubts reached via deer trail or brambly bushwhacking.