NASHVILLE, Tenn. - Biomass has become the darling of the renewable-energy world in Tennessee and throughout the Southeast, and a new study takes a close look at the good and bad.

Biomass refers to burning wood-production leftovers to generate electricity, compressing them into fuel pellets, and wood- ethanol production. The latter is the focus in Tennessee.

David Carr, senior attorney at the Southern Environmental Law Center, says this study shows that even renewable-energy sources also can be carbon-pollution sources.

"This new study shows that EPA and other policymakers cannot assume that biomass energy has no effect on CO2 levels in the atmosphere."

The study finds a spike in pollution during at least the first 35 years of biomass production, and recommends state and federal policies which encourage efficient technologies to reduce the load. The federal Environmental Protection Agency also is studying biomass carbon emissions.

Robert Perschel, eastern forests director at the Forest Guild, cites other considerations as well, including how removing woody debris from forests affects soil health, water quality and wildlife, as well as the short- and long-term pollution picture.

"We can use biomass for 35 to 50 years to produce electricity. We'll have less carbon in the atmosphere than if we had used fossil fuels. If we use biomass for more than 50 years, we'll have less carbon than when we started."

The carbon picture could become more complicated as the biomass industry grows, Perschel says. If more live trees are cut for production, that means fewer trees in forests to naturally absorb carbon in the atmosphere.

The study, "Biomass Supply and Carbon Accounting for Southeastern Forests," was conducted by the Biomass Energy Resource Center, Forest Guild and Spatial Informatics Group on behalf of the National Wildlife Federation and Southern Environmental Law Center, and is online at biomasscenter.org.


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New research from the University of New Hampshire could help dairy farmers increase profits while reducing their effect on the climate.

Scientists said adding a plant-based essential oil blend to cow feed can improve a cow's digestion and reduce the release of methane, a potent greenhouse gas.

Andre Brito, associate professor of dairy cattle nutrition and management at the University of New Hampshire, said the findings are especially true for pasture grazing cows and shows a happy cow makes for a healthier environment.

"If those animals are provided those conditions, they'll be more productive," Brito pointed out. "Then the amount of methane that's being emitted by those animals is diluted because they're producing more product."

Brito reported adding the plant oils led to a more than 6% increase in milk production, which is good news for the majority of New Hampshire dairies, especially small to mid-size operations with smaller profit margins and higher equipment costs.

Still, Brito noted the research findings could translate to larger, industrial-size dairies. The factory farms often hold thousands of cows, generating significant methane emissions through their hearty burps and manure, which is often stored in large, polluting lagoons.

Brito acknowledged although the plant-based oils are readily available for use, farmers must weigh the economic benefits and overall environmental impact.

"Any investment that the farmers would make in a product has to be tied to economics," Brito stressed. "Even though farmers overall, they are conscious about the environment and they want to make sure that there is less carbon, nitrogen footprint out of their farms."

Brito's research was conducted on cows as they transitioned from the winter indoor-feeding schedule to eating their favorite plants in the pasture, a diet change which can increase the cow's emissions.

Brito added he hopes the research can help farmers better understand when to add the oils to the cow feed to potentially reduce the cow's overall climate effect.


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State officials in Maine are highlighting apprenticeships as a way to earn a living wage and contribute to the state's growing green economy.

They'll kick off the first-ever Youth Apprenticeship Week by exposing high school students to the numerous ways they can learn and earn in offshore wind energy development, passive home construction, aquaculture, and more.

Maine Department of Labor Apprenticeship Program Manager Kristine McCallister said about 90% of apprentices choose to stay with their employer after their training is complete.

"Apprentices have a mentor and they're earning wages and they're earning pay increases as they go," said McCallister, "so it's a really great way to attract talent to Maine and to keep talent here."

McCallister said apprentices will earn $300,000 more over their lifetime. The state aims to add 75,000 more workers to the economy over the next five years by growing career training pipelines.

A report by the Maine Labor Climate Council finds the state can create tens of thousands of jobs by building a zero-carbon transportation system.

Workers will be needed to install EV charging stations, electrify school bus fleets, and potentially build a high-speed rail line from Bangor to Boston.

McCallister said new Mainers, like those studying with Portland Adult Education, are using apprenticeships to fill these roles and other clean-energy jobs.

"Those pre-apprentices just graduated and have interviewed with some of our apprenticeship programs," said McCallister, "so we're really hoping they're going to help feed that pipeline as this economy is booming in Maine in terms of the renewable-energy sector."

McCallister said some companies are even offering on-the-spot interviews and job offers this week. All apprenticeship events are listed on the Department of Labor's website.




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Climate watchers are predicting this summer's temperatures may set records, which could aggravate some medical conditions.

A 30-year study of health records from more than 200 countries and territories suggests a connection between stroke and climate change. The online publication "Neurology" reported the growing number of global deaths and disabilities from strokes are linked to -- but not caused by -- climate change.

Dr. Ann Jones, stroke neurologist at Indiana University Hospital, said when the body feels extreme heat and sweat evaporates, hypercoagulation, or blood thickening, occurs, which increases the chance for blood clots. Winter weather can also produce an instinctive response.

"The cold makes us kind of react with our fight-or-flight kind of drive, and it makes our blood vessels close down or vasoconstrict," Jones explained. "That can raise blood pressure up and that can predispose you to stroke."

Jones noted an ischemic stroke involves a clogged artery preventing blood from flowing to brain tissue. A ruptured artery during a hemorrhagic stroke causes blood to travel outside the artery wall into the brain tissue.

The Centers for Disease Control and Prevention reported almost 43% or 3,500 per 100,000 Hoosiers died from a stroke in 2021. Indiana ranks 34th in the nation for the rate of strokes.

The Yale Center on Climate Change and Health found heat can increase the risk of a stroke. Recent global burden-of-disease studies found 2 to 5 million deaths per year are linked to extreme temperatures globally. And climate change can also indirectly impact health through poor water quality, air pollution and increased spreading of infectious diseases.

Jones maintained good health is a start toward prevention and recommends the Mediterranean diet; consuming less red meat for optimal well-being and getting 30 minutes of exercise five times per week.

"Some things are out of our control," Jones acknowledged. "But just taking care of yourself in the ways that we can; focusing more on vegetables, fish, and staying hydrated, working on blood pressure with that reduced goal of less than 130 over 80."

The study indicated more research could identify the impact of temperature change on stroke as a way to address health inequalities including the burning of fossil fuels, deforestation and industrial processes.