March 2023

Electricity generated from renewables surpassed coal in the United States for the first time in 2022, the U.S. Energy Information Administration announced Monday.

Renewables also surpassed nuclear generation in 2022, after first doing so last year.

Growth in wind and solar significantly drove the increase in renewable energy and contributed 14% of the electricity produced domestically in 2022. Hydropower contributed 6%, and biomass and geothermal sources generated less than 1%.

“I’m happy to see we’ve crossed that threshold, but that is only a step in what has to be a very rapid and much cheaper journey,” said Stephen Porder, a professor of ecology and assistant provost for sustainability at Brown University.

California produced 26% of the national utility-scale solar electricity followed by Texas with 16% and North Carolina with 8%.

The most wind generation occurred in Texas, which accounted for 26% of the U.S. total followed by Iowa (10%) and Oklahoma (9%).

“This booming growth is driven largely by economics,” said Gregory Wetstone, president and CEO of the American Council on Renewable Energy. “Over the past decade, the levelized cost of wind energy declined by 70%, while the levelized cost of solar power has declined by an even more impressive 90%.

“Renewable energy is now the most affordable source of new electricity in much of the country,” he added.

The Energy Information Administration projected that the wind share of the U.S. electricity generation mix will increase from 11% to 12% from 2022 to 2023 and that solar will grow from 4% to 5% during the period. The natural gas share is expected to remain at 39% from 2022 to 2023, and coal is projected to decline from 20% last year to 17% this year.

“Wind and solar are going to be the backbone of the growth in renewables, but whether or not they can provide 100% of the U.S. electricity without backup is something that engineers are debating,” said Porder, of Brown University.

Many decisions lie ahead, he said, as the proportion of renewables that supply the energy grid increases.

This presents challenges for engineers and policymakers, Porder said, because existing energy grids were built to deliver power from a consistent source. Renewables such as solar and wind generate power intermittently. So battery storage, long-distance transmission and other steps will be needed to help address these challenges, he said.

The EIA report found the country remains heavily reliant on the burning of climate-changing fossil fuels. Coal-fired generation was 20% of the electric sector in 2022, a decline from 23% in 2021. Natural gas was the largest source of electricity in the U.S. in 2022, generating 39% last year compared to 37% in 2021.

“When you look at the data, natural gas has been a major driver for lowering greenhouse gas emissions from electricity because it’s been largely replacing coal-fired power plants,” said Melissa Lott, director of research for the Center on Global Energy Policy at Columbia University.

“Moving forward, you can’t have emissions continuing to go up, you need to bring them down quickly,” she added.

The Inflation Reduction Act (IRA) influenced the amount of renewable energy projects that went online in 2022, Lott said, and it’s expected to have a “tremendous” impact on accelerating clean energy projects.
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The World Health Organization says about 87% of Sudanese females between ages 15 and 49 have undergone female genital mutilation, one of the highest rates in the world. A project by the U.N. children’s agency, UNICEF, is targeting sports clubs to engage men and boys in the fight against the practice. Henry Wilkins reports from Khartoum, Sudan.
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Scientists have long known that wild seabirds ingest bits of plastic pollution as they feed, but a new study Monday shows the tiny particles don’t just clog or transit the stomach but can subvert its complex mix of good and bad bacteria, too.

Plastic-infested digestive tracts from two species of Atlantic seabirds, northern fulmars and Cory’s shearwaters, showed a decrease of mostly beneficial “indigenous” bacteria and more potentially harmful pathogens.

There was also an increase in antibiotic-resistant and plastic-degrading microbes, researchers reported in the journal Nature Ecology & Evolution.

The findings suggested that certain types of microplastic may be leeching chemicals that disrupt the birds’ so-called gut microbiome.

Microplastics — produced when plastic products break down in the environment — are directly and indirectly ingested across most animal food chains.

They can be found in every corner of the world, from the deepest trenches of oceans to the top of Mount Everest.

In humans, they have been detected in the blood, breast milk and placentas.

The new study supports previous findings that prolonged ingestion of microplastics causes an imbalance of healthy and unhealthy bacteria in the stomach, a condition known as gut dysbiosis.

The implications are far-reaching.

Like humans, birds have evolved with a vast network of microbes, including bacteria, that live in our bodies in communities called microbiomes.

Some microbes cause diseases, but most exist as “friendly” bacteria with a critical role in digestion, immune response and other critical functions.

“There’s a symbiosis that goes on — and that’s the case in the seabirds as well as in humans,” lead author Gloria Fackelmann of Ulm University in Germany told AFP.

Little is known about the effects of individual microbes on the body.

But overall, a growing body of research points to the harmful impacts of microplastics on animal health.

The tiny particles — less than 5 millimeters in diameter — can cause cell death and allergic reactions in humans.

Chemicals in microplastics have also been linked to increased risks of cancer, reproductive problems and DNA mutations.

The authors hope the findings in seabirds will spur related studies for humans.

“If this man-made substance could alter our microbiome, I think that should make people think,” said Fackelmann.
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The Webb Space Telescope has found no evidence of an atmosphere at one of the seven rocky, Earth-sized planets orbiting another star.

Scientists said Monday that doesn’t bode well for the rest of the planets in this solar system, some of which are in the sweet spot for harboring water and potentially life.

“This is not necessarily a bust” for the other planets, Massachusetts Institute of Technology astrophysicist Sara Seager, who wasn’t part of the study, said in an email. “But we will have to wait and see.”

The Trappist solar system — a rarity with seven planets about the size of our own — has enticed astronomers ever since they spotted it just 40 light-years away. That’s close by cosmic standards; a light-year is about 5.8 trillion miles. Three of the seven planets are in their star’s habitable zone, making this star system even more alluring.

The NASA-led team reported little if any atmosphere exists at the innermost planet. Results were published Monday in the journal Nature.

The lack of an atmosphere would mean no water and no protection from cosmic rays, said lead researcher Thomas Greene of NASA’s Ames Research Center.

As for the other planets orbiting the small, feeble Trappist star, “I would have been more optimistic about the others” having atmospheres if this one had, Greene said in an email.

If rocky planets orbiting ultracool red dwarf stars like this one “do turn out to be a bust, we will have to wait for Earths around sun-like stars, which could be a long wait,” said MIT’s Seager.

Because the Trappist system’s innermost planet is bombarded by solar radiation — four times as much as Earth gets from our sun — it’s possible that extra energy is why there’s no atmosphere, Greene noted. His team found temperatures there hitting 450 degrees Fahrenheit (230 degrees Celsius) on the side of the planet constantly facing its star.

By using Webb — the largest and most powerful telescope ever sent into space — the U.S. and French scientists were able to measure the change in brightness as the innermost planet moved behind its star and estimate how much infrared light was emitted from the planet.

The change in brightness was minuscule since the Trappist star is more than 1,000 times brighter than this planet, and so Webb’s detection of it “is itself a major milestone,” the European Space Agency said.

More observations are planned not only of this planet, but the others in the Trappist system. Looking at this particular planet in another wavelength could uncover an atmosphere much thinner than our own, although it seems unlikely it could survive, said Taylor Bell of the Bay Area Environmental Research Institute, who was part of the study.

Further research could still uncover an atmosphere of sorts, even if it’s not exactly like what’s seen on Earth, said Michael Gillon of the University of Liege in Belgium who was part of the team that discovered the first three Trappist planets in 2016. He did not take part in the latest study.

“With rocky exoplanets, we are in uncharted territory” since scientists’ understanding is based on the four rocky planets of our solar system, Gillon said in an email.

Launched in late 2021 to an observation post 1 million miles (1.6 million kilometers) away, Webb is considered the successor to the Hubble Space Telescope, orbiting Earth for more than three decades.

In the past, Hubble and the Spitzer Space Telescope scoured the Trappist system for atmospheres, but without definitive results.

“It is just the beginning, and what we can learn with the inner planets is going to be different from what we can learn from the other ones,” MIT’s Julien de Wit, who was not involved in the study, said in an email.
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Florida has captured more than 17,000 Burmese pythons since 2000, but tens of thousands more are likely roaming the Florida Everglades. That’s a concern because the reptiles, which are not native to the area, are gobbling up the competition.

“[Pythons] can take out one of our apex predators, which are alligators and crocodiles, and then it’ll take down some of the other native animals that are small mammals — some of the rats, the mice, the marsh bunnies — things that are supposed to be food for other things,” says Mike Hileman, park director of Gatorland, a theme park and wildlife preserve in Orlando. “So, they compete with our native animals, and because they’re a more dominant species, they win that battle.”

The Everglades is among the world’s most unique and delicate ecosystems. The python invasion is upsetting the fragile balance of the 6 million-square-kilometer wetlands preserve, which is home to rare and endangered species like manatees, the Florida panther and the American crocodile.

“Once a species starts reproducing in the wild, and they have a system that works for them, it’s almost next to impossible to eradicate them,” Hileman says.

Florida is grappling with the most severe invasive animal crisis in the continental United States. The invasives flourish in the state’s subtropical climate, characterized by hot, humid summers and wet, mild winters. There are more than 500 non-native plant and wildlife species in the state, some of which — like pythons — are taking over the habitat and threatening the environment.

“They form almost like a monoculture of the invasives, and when your biodiversity plummets, then the environment isn’t as able to withstand perturbations like climate change,” says Kurt Foote, a ranger with the National Park Service and natural resource management specialist at Fort Matanzas National Monument in St. Augustine. “Nature relies on variety, and when you don’t have variety, it’s just more susceptible to collapse.”

There is a flourishing reptile pet trade in Florida. In 1992, Hurricane Andrew destroyed a Burmese python breeding facility, releasing the animals into the wild. The Category 5 hurricane also leveled thousands of homes, setting numerous exotic pets free.

However, the very first Burmese python was found in the Everglades in 1979, more than a decade before Hurricane Andrew, and was probably a pet that escaped or was intentionally released by its owner. Florida residents are no longer allowed to keep Burmese pythons as pets.

“Animals can be a lot of work. The parrots are loud; they live almost 80 years. Tortoises can get really big and live 100 years. So, it’s a big commitment to have a lot of these animals,” says Kylie Reynolds, deputy director of Amazing Animals Inc., a nonprofit exotic animal preserve in St. Cloud that takes in non-native animals that were once people’s pets.

“People sometimes just go, ‘You know, it’s nice in Florida. We’ll just let it loose.’… Maybe they think their animal would be happier free. But again, they could compete for our natural resources with our native wildlife,” Reynolds says.

In addition to Burmese pythons, Florida’s most problematic invasive animals include lionfish, feral hogs, Argentine black and white tegu lizards, and Cuban tree frogs, which can be found in many parts of the state, including Fort Matanzas.

“They’re a bigger tree frog than what we have here by quite a bit, and they’re also fairly omnivorous, and they will eat the native tree frogs,” Foote says. “Like a lot of invasives, when they get here, they don’t have the things that predated them or competed with them in their homelands. They get here and without that pressure, they’re able to really breed and reproduce.”

Feral hogs, originally brought to Florida by Spanish explorers in the 1500s, cause millions of dollars’ worth of damage to crops each year. The animals, which are found statewide, disrupt the soil in areas such as Lake Apopka in Mount Dora that biologists are trying to restore.

“We’re planting native vegetation. … A lot of times, they’re rare or endemic species,” says Ben Gugliotti, land manager of Lake Apopka North Shore, a nature preserve. “The hogs will come in and root up those areas, basically destroying the planting areas that we’re trying to restore. And then also actually create a secondary opening for invasive plant species that move into those disturbed soil areas.”

Argentine black and white tegu lizards are on the mind of Cheryl Millett, manager of The Nature Conservancy’s Tiger Creek preserve in Babson Park, which sits on Florida’s oldest and highest land mass.

“It’s a biodiversity hotspot. And yeah, we have a lot of things that … don’t exist anywhere else,” Millett says. “And if we lost them here, we wouldn’t have them anymore on Earth.”

She’s most concerned about tegu lizards, which haven’t reached Tiger Creek yet but have been spotted nearby. They can grow up to 1.5 meters long.

“They found baby gopher tortoises in the guts of tegu lizards that have been found in South Florida,” Millett says. “They can eat baby gopher tortoises. I’m really worried about their potential impact here.”

Gopher tortoises are listed as federally endangered. They are a keystone species, which means they are critical to the surrounding ecosystem because they provide shelter for hundreds of other animals.

“[Tegu lizards] love gopher tortoise burrows, and they’ve been found using gopher tortoise burrows in South Florida,” Millett says. “Gopher tortoises create these burrows. They’re like 10 feet deep, and can be 30 feet long, and they harbor over 300 different species in them.”

Florida spends more than $500 million a year trying to contain invasive species and the damage they cause. Officials organize hunts, exotic pet amnesty programs, and utilize other methods to combat invasive species. But it might come down to educating the future.

“Our generation, we already have preconceived ideas. We’re lost. We’re not going to change anything,” says Hileman of Gatorland, who speaks to school groups about wildlife conservation. “We’ve got to get with the little guys, and we got to get them on the same team so they can spread that message to their kids as they get older.”
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