1 . A new study says that more than half the world’s ocean area is “becoming greener”, and the trend is connected to human-caused global warming.

It’s not clear what is driving the greening. In some places, it could indicate changes in the amount of plankton or other organic material floating in the water. Plankton are a cornerstone of the ocean food chain, and these kinds of shifts could have ripple effects throughout the entire marine ecosystem.

The study, published on Wednesday in the journal Nature, examines 20 years of satellite data measuring light reflected at the surface of the water all across the globe, subtle changes that aren’t necessarily visible to the naked eye. The research finds that 56 percent of the world’s oceans are shifting in color — and on the whole, they’re growing greener. The trend is especially strong in the lower latitudes, including the subtropics and tropics.

The researchers then used a computer model to find out whether climate change was playing a part. They conducted one set of simulations representing the oceans under a strong climate change scenario, and then compared them with a second set of simulations imagining a world in which climate change didn’t exist. The model suggests that rising global temperatures are to blame.

The exact reasons still require some scientific digging. While climate change seems to be the culprit, the study also indicates that rising ocean temperatures in and of themselves aren’t driving the greening.

There are plenty of other ways global warming is affecting the world’s oceans, by changing the structure and flow of certain currents, for instance. These kinds of changes can affect the growth of phytoplankton and other factors that might be contributing to the greening.

The findings weren’t a surprise to the researchers. They’re consistent with the way researchers expect the global oceans to change as the world keeps on warming.

“I’ve been running simulations that have been telling me for years that these changes in ocean color are going to happen,” study co-author Stephanie Dutkiewicz, a senior research scientist at the Massachusetts Institute of Technology, said in a statement. “To actually see it happening for real is no unexpected, but frightening.”

3 . A NASA climate research scientist, Cynthia Rosenzweig, who has spent much of her career explaining how global food production must adapt to a changing climate, was awarded the World Food Prize on Thursday.

“We basically cannot solve climate change unless we address the issues of the greenhouse gas emissions from the food system, and we cannot provide food security for all unless we work really hard to develop adaptable agricultural systems,” she told The Associated Press in an interview.

Rosenzweig, who describes herself as a climate impact scientist, grew up in Scarsdale, New York, a suburban area that she said led her to seek out life in the country. Later, she moved to Italy, and developed a passion for agriculture. After returning to the United States, she focused her education on agronomy (农学).

She worked as a graduate student at the Goddard Institute for Space Studies in the early 1980s, when global climate models were beginning to show the effects of human-generated carbon dioxide on the global climate. As the only team member studying agronomy, she researched the impact on food production and has been working since then to answer those questions.

Rosenzweig’s work led to the Environmental Protection Agency’s first prediction of the effects of climate change on the nation’s agricultural regions in the agency’s assessment of the potential effects of climate change on the United States in 1988. She was the first to bring climate change to the attention of the American Society of Agronomy and she organized the first sessions on the issue in the 1980s. The research organization she founded, AgMIP, develops adaptation packages, which could include the use of more drought-tolerant seeds and improved water management practices.

Even the largest agribusiness corporations have shown a willingness to listen. Some models her colleagues have developed show how businesses could be effected by climate change and how they have a role to play in reducing the impact on climate.

“It’s really a global partnership of all the global food systems to come together to restrain climate change and maintain the food security for the planet,” she said.

4 . Take a period of limited rainfall. Add heat. And you have what scientists call a ‘hot drought’ — dry conditions made more intense by the evaporative power of hotter temperatures.

A new study, published in the journal Science Advances, Wednesday, finds that hot droughts have become more common and severe across the western U.S. as a result of human-caused climate change. “The frequency of compound warm and dry summers particularly in the last 20 years is unprecedented,” said Karen King, lead author of the study and an assistant professor at the University of Tennessee in Knoxville.

For much of the last 20 years, western North America has been under the control of a huge drought that has strained crop producers, city planners and water managers. Scientists believe it to be the driest period in the region in at least 1,200 years. They reached that determination, in part, by studying the rings of trees collected from thousands of sites across the Western U.S..

Cross-sections or cores of trees, both living and dead, can offer scientists windows into climate conditions of the past. Dark scars can show where fires have burned. Pale rings can indicate insect outbreaks. “Narrow rings mean less water,” said King, a dendrochronologist, who specialized in tree ring dating. “Fatter rings, more water.” Scientists have looked at tree ring widths to understand how much water was in the soil at a given time. King and fellow researchers did something different. They wanted to investigate the density (密度) of individual rings to get a picture of historical temperatures. In hotter years, trees build thick walls to protect their water.

By combining that temperature data with another tree-ring-sourced dataset looking at soil moisture (湿度), the researchers showed that today’s hotter temperatures have made the current western huge drought different from its past ones.

It also suggests that future droughts will be worsened by higher temperatures, particularly in the Great Plains, home to one of the world’s largest aquifers, and the Colorado River Basin, the source of water for some 40 million people.

5 . Must-See Destinations in 2024

Are you ready to explore the world in 2024? Whether you dream of sailing down famous European rivers or exploring unique places, our list of must-see destinations is here to inspire your travels.

Throw yourself into the rich culture and history of Spain. From the sunny beaches of Tenerife to the Moorish architecture (建筑物) of Andalucía, there’s so much to explore in this lively country. Discover the UNESCO World Heritage (遗产) city of La Laguna and become amazed at the beauty of Cordoba, Seville, and La Alhambra, or relax on a beach holiday to Majorca or Tenerife.

Despite its size, Montenegro has beautiful beaches, rich history, and a breathtaking channel. Experience the beauty of the Montenegrin coast — Dalmatia’s jewel (宝石) is the UNESCO World Heritage listed oasis of Dubrovnik, famously praised by Lord Bryon as The Pearl of the Adriatic.

Discover the beauty that is Dubrovnik. Explore the 16th-century city’s defensive walls and red-roofed buildings. Sail along Croatia’s Adriatic Coast, where attractive villages and beautiful towns like Pula, Rovinj, and Poreč are just waiting to be explored...

Explore the wonders of South Africa, from the Garden Route’s nature reserves to the thrill of a Safari drive in the Kariega Game Reserve. Discover the different plants and animals while searching for the “Big Five” on an unforgettable South Africa holiday.

With over 25 years of experience creating holidays for the curious, Travel Department ensures that your journey is in good hands. Plus as a trusted Reader’s Digest Travel partner, you can get special deals when you travel with them across lots of different 2024 holidays. If you want to know more information, please click here.

7 . Air pollution remains a critical health risk in the European Union, claiming over 500,000 lives in 2021, with findings suggesting nearly half of these could have been prevented if pollution were reduced to levels recommended by health experts. Data from the European Environment Agency (EEA) show that of these deaths, 253,000 were linked to exposure to fine particulate matter (PM2.5) going beyond the World Health Organization’s (WHO) guideline limit of 5 micrograms per cubic meter. These particles are especially dangerous as they can pass into the bloodstream and affect various organs. Nitrogen dioxide and ozone also contributed to the mortality (死亡频率) statistics, associated with 52,000 and 22,000 deaths respectively. The EU’s environment commissioner, Virginijus Sinkevicius, underlined that air pollution poses the top environmental health risk in the EU. Nevertheless, there is evidence of improvement, with deaths from PM2.5 decreasing by 41% between 2005 and 2021, and the EU targets a reduction of 55% by 2030.

In response to these concerns, the WHO, which updated its air quality guidelines in 2021, warns that no level of air pollution can be considered safe but has set upper limits for certain pollutants. The European Parliament vote to bring the EU’s air quality standards in line with the WHO but decided to delay doing so until 2035.

Sinkevicius said that air quality is indeed improving due to effective clean air policies. Beyond death counts, the EEA also assessed air pollution’s broader impact on diseases such as asthma, chronic obstructive pulmonary disease, and diabetes, stressing not only mortality but the quality of life impacts. EEA researcher Alberto Gonzalez Ortiz pointed to severe disability states caused by these conditions, worsened by air pollution.

The EEA’s comprehensive approach shows that while the fight against air pollution has seen progress, immediate action is still critical to reduce pollution and reduce its widespread effects on public health.

8 . Not all birds sing, but those that do—some several thousand species—do it a lot. All over the world, as soon as light filters over the horizon, songbirds start singing. They sing to defend their territory and to impress potential mates.

“Why birds sing is relatively well-answered,” says Iris Adam, a behavioral neuroscientist at the University of Southern Denmark. The big question for her was this: Why do birds sing so much? “For some reason,” Adam says, birds have “a crazy drive to sing.” This means hours every day for some species, and that takes a lot of energy. Plus, singing can be dangerous.

“As soon as you sing, you reveal yourself,” she says. “Like, where you are, that you even exist, where your territory is —all of that immediately is out in the open for predators, for everybody.”

In a new study published in the journal Nature Communications, Adam and her colleagues offer a new explanation for why birds take that risk. They suggest that songbirds may not have much choice. They may have to sing a lot every day to give their vocal muscles the regular exercise they need to produce top-quality song.

These findings could be related to human voices too. “If you apply the bird results to the humans,” says Adam, “anytime you stop speaking, for whatever reason, you might experience a loss in vocal performance.”

To figure out whether the muscles that produce birdsong require daily exercise, Adam designed a series of experiments on zebra finches —little Australian songbirds with striped heads and a bloom of orange on their cheeks.

Through these experiments. Adam’s conclusion is that “songbirds need to exercise their vocal muscles to produce top-performance song. If they don’t sing, they lose performance, their vocalizations get less attractive to females—and that’s bad.”

This may help explain songbirds’ constant singing. It’s a kind of daily vocal practice to keep their instruments in tip-top shape. It’s a good rule to live by, whether you’re a bird or a human—practice makes perfect, at least when it comes to singing one’s heart out.