International
Chile’s distant paradise where scientists study climate change
AFP | Alberto Peña
Hidden inside pristine forests in Chile’s deep south, known as the end of the world, lie potential early warning signs of climate change. Puerto Williams on Navarino island, which is separated from the South American mainland by the Beagle Channel, is the world’s southern-most town.
Far from the pollution that blights major urban and industrial centers, it is a paradise that provides unique conditions to study global warming.
“There is nowhere else like it,” Ricardo Rozzi, director of the Cape Horn International Center for global change studies and bio-cultural conservation in Puerto Williams, told AFP.
It is “a place that is especially sensitive to climate change” as average temperatures do not rise above five degrees Celsius. This cold and windy area is the last inhabited southern frontier before reaching the Antarctic.
The ethnobotanical Omora park is home to an immense variety of lichens, mosses and fungi that scientists study by crouching down onto their knees with magnifying glasses.
In the crystal clear Robalo river, minuscule organisms act as sentinels of the changes produced by global warming. In both the park and river, the alarm bells are ringing.
Moss and lichen on the move
At this latitude — 55 degrees south — climate change has an exponential effect on flora that react by seeking out low temperatures, said Rozzi, 61. “The most obvious aspect of climate change is the rising temperatures,” he said. “These lichens cannot survive” if a certain threshold is passed. To escape the higher temperatures, they move.
“In the case of (mosses) we’ve noticed that they have moved. Before they were between 50 and 350 (meters above sea level) and now they are between 100 and 400,” said Rozzi. He says Omora has more diversity per square meter of lichens and mosses than anywhere else in the world. They also help to absorb carbon dioxide.
Another aspect is the elevational diversity gradient, an ecological pattern in which biodiversity changes with elevation.
The 700-meter high Bandera hill’s biodiversity changes every 200 meters and there is a mammoth 1.5 degrees Celsius difference in temperature between top and bottom.
“We can see what changes happen in the high mountains and in the area close to the sea in a very short distance, and we can see how the temperature affects the biodiversity that lives in this river,” Tamara Contador, 38, a biologist at the Cape Horn International Center, told AFP.
She studies the gradients themselves. If the height difference between gradients rises or falls on the mountain, scientists can determine whether there has been a global change in temperature. They say there has been.
Avoiding ‘extermination’
“On a global level, the polar and subpolar ecosystems are the most affected by climate change, so we are in a place where climate change has a much bigger effect on biodiversity than other places,” said Contador.
River organisms also form part of the alert system.
“The organisms that live here are also indicators of water quality and global environmental change,” added Contador.
River organisms move about and have already increased their reproductive cycle, says Rozzi. This confirms there has been a small change to the climate in the area that could have been much greater elsewhere on the planet.
“Some insects that have an annual eggs to larvae to adulthood cycle are now having two cycles because the temperature has risen,” said Rozzi.
By studying these organisms and learning from them “we can avoid crossing the threshold that brings us to the extermination of humanity and other life forms,” he added.
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A glacier over Darwin's mountain range is seen during a journey through the Beagle Channel in the Magallanes region, the southernmost of Chile, on September 23, 2022. - There is a place at the end of the world, in the southernmost point of Chile, where pristine forests hide tiny systems in their depths that already give early warning of the global climate change that the planet is suffering. Beyond the place where the American continent ends, on Navarino Island, crossing the Beagle Channel, Puerto Williams stands as the southernmost city in the world, a place far from pollution and human mistreatment, with unique conditions for the study of climate change. (Photo by Alberto PEÑA / AFP)
International
Heat wave puts more than 70 million Americans under alerts as temperatures near 46°C
More than 70 million people remained under heat alerts Monday as an intense heat wave continued across the southern United States, particularly Florida and states along the Mexican border, where temperatures and heat indexes could reach as high as 46 degrees Celsius, according to the National Weather Service (NWS).
Several cities recorded or tied temperature records over the weekend and into Monday, including Miami and Fort Lauderdale in Florida; Laredo, Borger and Austin’s airport in Texas; Atlanta, Georgia; Raleigh and Charlotte, North Carolina; and Memphis, Tennessee.
The NWS warned that the heat wave will continue affecting the southern and southeastern United States, with maximum temperatures expected to remain near 38°C to 40°C for several days. The heat index, which combines temperature and humidity to estimate how hot conditions feel, could reach 46°C.
The extreme heat is also spreading into the Southwest, where temperatures began rising again between Monday and Tuesday. Forecast highs in the region range from about 38°C to 43°C.
Heat alerts remain in effect across Nevada, Arizona and California, including areas in southern Arizona and California near the Mexican border, as authorities warn of the risks posed by prolonged extreme temperatures.
The NWS urged residents to limit outdoor activity, stay hydrated, ensure access to air conditioning or cooling centers, and check on vulnerable friends, neighbors and family members.
The United States is experiencing a summer marked by above-average temperatures and repeated heat waves. One of the most intense episodes occurred during the July 4 weekend, when extreme heat was blamed for roughly 30 deaths.
July was the hottest month ever recorded in the United States since measurements began, with the average temperature across the contiguous country approaching 25°C, according to the National Oceanic and Atmospheric Administration (NOAA).
The combination of extreme heat and drought conditions has also fueled wildfires. Nearly 3 million hectares have burned across the country so far in 2026, making it the largest area affected by wildfires in a decade.
International
Trump warns Iran over nuclear ambitions as U.S.-Iran ceasefire deadline passes
U.S. President Donald Trump reiterated Monday that Iran must never be allowed to obtain a nuclear weapon, as a 60-day deadline set under a memorandum of understanding between Washington and Tehran expired without an agreement to end the conflict in the Middle East.
“The number one goal is, and always will be, that Iran cannot have, in any way or under any circumstances, a nuclear weapon,” Trump wrote in a post on his Truth Social platform.
The memorandum, signed on June 17, called for an “immediate and permanent cessation of military operations on all fronts” as part of a broader negotiation process aimed at ending the conflict. However, the deadline expired Monday without a peace agreement, while both Washington and Tehran continued to maintain their respective positions.
The expiration is largely symbolic, as military clashes resumed during the 60-day period. The Strait of Hormuz also remains blocked, contributing to elevated global oil prices.
Trump escalated his rhetoric toward Tehran last Friday, saying he planned to declare the Strait of Hormuz U.S. territory after defeating Iran.
“After we finish defeating Iran, which is being very badly defeated, very soon I will essentially declare the Strait of Hormuz U.S. territory,” Trump said during a political rally in Long Island, New York. He also claimed that the United States currently controls the passage of vessels through the strategic waterway.
Meanwhile, U.S. Treasury Secretary Scott Bessent said Washington is preparing additional economic measures against Iran that he described as unprecedented.
“Stay tuned for new announcements next week because we are going to implement measures unlike anything ever seen in the history of the economic isolation of a country,” Bessent said.
The Treasury secretary indicated that the measures would form part of a broader “double hit” strategy that could also involve maintaining the blockade of Iranian ports.
International
Brazil’s Lula and Flávio Bolsonaro kick off election campaigns amid focus on crime
Public security took center stage Sunday as Brazilian President Luiz Inácio Lula da Silva and Senator Flávio Bolsonaro formally launched their election campaigns, positioning themselves as the leading rivals ahead of the October presidential vote.
Lula, who leads most opinion polls, kicked off his campaign at the Vila Euclides stadium in São Bernardo do Campo, in São Paulo state, while Bolsonaro held his event in Rio de Janeiro, a political stronghold of his family.
During his speech, Lula announced plans to create a new Ministry of Public Security aimed at strengthening coordination between the federal government and Brazil’s states in the fight against crime.
The president pledged a tougher strategy to reclaim territories controlled or influenced by criminal groups. The proposed ministry would help “share responsibilities with the states” and confront those who seek to control favelas and impoverished neighborhoods, Lula told supporters.
The initiative places public security at the heart of Lula’s campaign as he seeks another term in office amid persistent concerns over crime and organized criminal activity in Brazil.
Lula also used his first campaign speech to reinforce his position as a leading figure of Brazil’s left and to criticize his political opponents on the right.
“I will not allow the right to take power,” Lula said, accusing his opponents of having previously mocked children who died because they lacked access to medicine.
“I don’t know what future these people imagine for the Brazilian people,” he added.
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