Category: earth

Chief among the health consequences of blue light is its ability to suppress the production of melatonin, the hormone that regulates sleep patterns in humans and other organisms. Numerous scientific studies have warned that increased exposure to artificial blue light can worsen people’s sleeping habits, which in turn can lead to a variety of chronic health conditions over time. The increase in blue light radiation in Europe has also reduced the visibility of stars in the night sky, which the study says “may have impacts on people’s sense of nature.” Blue light can also alter the behavioural patterns of animals including bats and moths, as it can change their movements towards or away from light sources.

Dr Nicholson’s team has to be cautious about tying the two impacts together. Nadir has been given a very similar date to Chicxulub based on an analysis of fossils of known age that were drilled from a nearby borehole. But to make a definitive statement, rocks in the crater itself would need to be pulled up and examined. This would also confirm Nadir is indeed an asteroid impact structure and not some other, unrelated feature caused by, for example, ancient volcanism. […] Prof Sean Gulick, who co-led the recent project to drill into the Chicxulub Crater, said Nadir might have fallen to Earth on the same day. Or it might have struck the planet a million or two years either side of the Mexican cataclysm. Scientists will only know for sure when rocks from the west African crater are inspected in the lab. “A much smaller cousin, or sister, doesn’t necessarily add to what we know about the dinosaurs’ extinction, but it does add to our understanding of the astronomical event that was Chicxulub,” the University of Texas at Austin researcher told BBC News.

The study found four main ways climate change exacerbates diseases. First, problems happen when changes cause disease-carrying animals to move closer to people. For example, animal habitats are disrupted by things like wildfires that drive bats and rodents into new areas, increasing the likelihood they’ll transmit diseases like Ebola to people. Other research shows that climate change makes viruses more likely to jump from animals to people, as happened with the coronavirus that causes COVID-19. That phenomenon also likely contributed to the 2016 Zika outbreaks.

According to our 2018 study in which we mapped the patch, the total amount of accumulated plastic is 79,000,000 kg, or 100,000,000 kg if we include the Outer GPGP. Thus, if we repeat this 100,000 kg haul 1,000 times — the Great Pacific Garbage Patch will be gone.

I’m proud of The Ocean Cleanup team for crossing this milestone, which is all the more remarkable considering System 002 is still an experimental system. Now our technology is validated, we are ready to move on to our new and expanded System 03, which is expected to capture plastic at a rate potentially 10 times higher than System 002 through a combination of increased size, improved efficiency, and increased uptime. Our transition to System 03 is starting soon.

To estimate how many people died from intense heat or cold, researchers with the Urban Health in Latin America project — which studies how urban environments and policies impact the health of city residents in Latin America — looked at mortality data between 2002 and 2015 from registries of 326 cities with more than 100,000 residents, in nine countries throughout Latin America. They calculated the average daily temperatures and estimated the temperature range for each city from a public data set of atmospheric conditions. If a death occurred either on the 18 hottest or the 18 coldest days that each city experienced in a typical year, they linked it to extreme temperatures. Using a statistical model, the researchers compared the risk of dying on very hot and cold days, and this risk with the risk of dying on temperate days. They found that in Latin American metropolises, nearly 6% — almost 1 million — of all deaths between those years happened on days of extreme heat and cold. They also created an interactive map with the data for individual cities.

When the team analyzed the specific cause of these deaths in the registries, they found — consistent with previous studies — that extreme temperatures are often linked to deaths from cardiovascular and respiratory diseases. Extreme heat makes the heart pump more blood and causes dehydration and pulmonary stress. Extreme cold, on the other hand, can make the heart pump less blood and cause hypotension and, in some cases, organ failure. The team also found older adults are especially vulnerable to extreme temperatures, with 7.5% of deaths among them correlated to extreme heat and cold during the study period. Although the numbers varied from year to year, in 2015, for instance, more than 16,000 deaths — out of nearly 855,000 — among people ages 65 or older were attributable to extreme temperatures. Latin America’s aging population is projected to rise more quickly than other parts of the world — from 9% in 2020 to 19% in 2050, by some estimates (PDF). […] Although deaths on extremely cold days — about 785,000 — were much higher than those on extremely hot days — about 103,000 — overall there were more days with intense cold, which could explain this difference. But for some cities, such as Buenos Aires, Rio de Janeiro, and Merida, heat is more deadly than cold: The researchers estimated that on very hot days, the chance of dying increases by 5.7% for every 1C increase in temperature.

India’s wheat exports hit 8.7 million tons in the fiscal year ending in March, with the government predicting record production levels — some 122 million tons — in 2022. But the country has just endured its hottest March since records began, according to the India Meteorological Department, and the heat wave is dragging well into harvest time. The heat wave is hitting India’s main wheat-growing regions particularly hard, with temperatures this week set to hit 112 F in Lucknow, Uttar Pradesh; 120 F in Chandigarh, Punjab; and 109 F in Bhopal, Madhya Pradesh. Devendra Singh Chauhan, a farmer from Uttar Pradesh’s Etawah district, told NBC News that his wheat crop was down 60 percent compared to normal harvests.

Oxitec, a private company, says its genetically modified bugs could help save half the world’s population from the invasive Aedes aegypti mosquito, which can spread diseases such as yellow fever, chikungunya and dengue to humans. Female offspring produced by these modified insects will die, according to Oxitec’s plan, causing the population to collapse. “Precise. Environmentally sustainable. Non-toxic,” the company says on its website of its product trademarked as the “Friendly” mosquito.

Scientists independent from the company and critical of the proposal say not so fast. They say unleashing the experimental creatures into nature has risks that haven’t yet been fully studied, including possible harm to other species or unexpectedly making the local mosquito population harder to control….

Nathan Rose, Oxitec’s head of regulatory affairs, noted that the company found its mosquito reduced the population in a Brazilian neighborhood by 95% in just 13 weeks. So far, Oxitec has released little of its data from that experiment or from a more recent release in the Florida Keys. It hasn’t yet published any of those results in a peer-reviewed scientific journal — publications that scientists expect when evaluating a new drug or technology….

Among scientists’ concerns is that releasing the genetically modified mosquitoes into neighborhoods could create hybrids that are hardier and more dangerous to humans than the state’s current population…. An EPA spokesperson said regulators expected that mosquitoes with the corporate genes “would disappear from the environment within 10 generations of mosquitoes because they are not able to reproduce as successfully as local populations.” To prove this, the agency has required Oxitec to monitor neighborhoods for mosquitoes that have DNA from its engineered insects until none have been found for at least 10 consecutive weeks.
One bioethicist at Harvard Medical School told the Times that California has never had a case where this breed of mosquitos had actually transmitted disease, and argued that America’s Environmental Protection Agency was “not a modern enough regulatory structure for a very modern and complicated technology.”
After the U.S. government’s approval, the genetically-engineered mosquitors still face several more months of scientific evaluation from California’s Department of Pesticide Regulation.
Thanks to long-time Slashdot reader schwit1 for sharing the link

By examining satellite images taken between 1991 and 2016, the researchers determined how long the rainforest took to bounce back after such events, The Guardian reported. The researchers determined that, since the turn of the 21st century, the rainforest has been taking longer and longer to recover biomass, meaning the mass of living trees and other vegetation, after droughts and fires. “That lack of resilience shows that, indeed, there is only so much of a beating that this forest can take,” Paulo Brando, a tropical ecologist at the University of California, Irvine who was not involved in the study, told The New York Times. If the rainforests surpasses this tipping point, the ecosystem could swiftly change into a vast savanna, unleashing tens of billions of tons of carbon dioxide during the transformation, The Guardian reported.

At this point, can anything be done to prevent the Amazon rainforest from turning into the Amazon savanna? Experts say there is. “These systems are highly resilient, and the fact that we have reduced resilience doesn’t mean that it has lost all its resilience,” Brando told the Times. “If you leave them alone for a little bit, they come back super strongly.” But it requires key steps to be taken, experts said. “We have to get to zero deforestation, zero forest degradation,” Carlos Nobre, a senior scientist at the National Institute of Amazonian Research in Brazil, who was not involved in the study, told the Times. “We still have a chance to save the forest.”

The energy sector accounts for around 40% of methane emissions from human activity, and this year’s expanded edition of the IEA’s Global Methane Tracker includes country-by-country emissions from coal mines and bioenergy for the first time, in addition to continued detailed coverage of oil and natural gas operations. Methane emissions from the energy sector grew by just under 5% last year. This did not bring them back to their 2019 levels and slightly lagged the rise in overall energy use, indicating that some efforts to limit emissions may already be paying off. “At today’s elevated natural gas prices, nearly all of the methane emissions from oil and gas operations worldwide could be avoided at no net cost,” said IEA Executive Director Fatih Birol. “The International Energy Agency has been a longstanding champion of stronger action to cut methane emissions. A vital part of those efforts is transparency on the size and location of the emissions, which is why the massive underreporting revealed by our Global Methane Tracker is so alarming.”

If all methane leaks from fossil fuel operations in 2021 had been captured and sold, then natural gas markets would have been supplied with an additional 180 billion cubic meters of natural gas. That is equivalent to all the gas used in Europe’s power sector and more than enough to ease today’s market tightness. The intensity of methane emissions from fossil fuel operations range widely from country to country: the best performing countries and companies are over 100 times better than the worst. Global methane emissions from oil and gas operations would fall by more than 90% if all producing countries matched Norway’s emissions intensity, the lowest worldwide.

“Twelve months later, the state’s electrical grid, while improved, is still vulnerable to weather-induced power outages.”

“If we got another storm this year, like Uri in 2021, the grid would go down again,” said Andrew Dessler, a professor of atmospheric sciences at Texas A&M University. “This is still a huge risk for us.”

Now, a recent study shows that electricity blackouts can be avoided across the nation — perhaps even during intense weather events — by switching to 100 percent clean and renewable energy, such as solar, wind and water energy. “Technically and economically, we have 95 percent of the technologies we need to transition everything today,” said Mark Jacobson, lead author of the paper and professor of civil and environmental engineering at Stanford University. Wind, water and solar already account for about one fifth of the nation’s electricity, although a full transition in many areas is slow.

The study showed a switch to renewables would also lower energy requirements, reduce consumer costs, create millions of new jobs and improve people’s health….

The team found the actual energy demand decreased significantly by simply shifting to renewable resources, which are more efficient. For the entire United States, total end-use energy demand decreased by around 57 percent. Per capita household annual energy costs were around 63 percent less than a “business as usual” scenario…. In Texas, a complete green transition would reduce the annual average end-use power demand by 56 percent. It also reduces peak loads, or the highest amount of energy one draws from the grid at a time. Jacobson said many homes would also have their own storage and wouldn’t need to rely on the grid as much.
The team also found interconnecting electrical grids from different geographic regions can make the power system more reliable and reduce costs. Larger regions are more likely to have the wind blowing, the sun shining or hydroelectric power running somewhere else, which may be able to help fill any supply gaps. “The intermittency of renewable energy declines as you look at larger and larger areas,” said Dessler. “If it’s not windy in Texas, it could be windy in Iowa. In that case, they could be overproducing power and they could be shipping some of their extra power to us.” The study stated costs per unit energy in Texas are 27 percent lower when interconnected with the Midwest grid than when isolated, as it currently is.

Interestingly, long-duration batteries aren’t important for grid stability. the team found, since our current 4-hour batteries can just be connected for longer-term storage. Professor Dessler tells the Post we should think of “renewables” as a system which includes storage technology and easily-dispatchable energy solutions.

And the Post adds that a grid powered by renewables “would also produce cleaner air, which could reduce pollution-related deaths by 53,000 people per year and reduce pollution-related illnesses for millions of people in 2050.”