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Sweltering heat is blanketing much of the planet and one unofficial analysis says the past seven days have been the hottest week on record, the latest grim milestone in a series of climate-change-driven extremes.
On Thursday, the National Oceanic and Atmospheric Administration distanced itself from the designation, compiled by the University of Maine's Climate Reanalyzer, which uses satellite data and computer simulations to measure the world's condition.
That metric showed the earth's average temperature on Wednesday remained at an unofficial record high of 17.18 degrees Celsius, set the day before.
For the seven-day period ending Wednesday, the daily average temperature was .04C higher than any week in 44 years of record-keeping, according to Climate Reanalyzer data.
Although the figures are unofficial, many scientists agree they indicate climate change is reaching uncharted territory.
The White House said the data showed the need for legislative action.
"The alarming extreme weather events impacting millions of Americans underscore the urgency of President Biden's climate agenda and the absurdity of continued efforts by Republican lawmakers to block and repeal it," spokesman Abdullah Hasan said.
NOAA, whose figures are considered the gold standard in climate data, said in a statement on Thursday it cannot validate the unofficial numbers.
It noted that the reanalyzer uses model output data, which it called "not suitable" as substitutes for actual temperatures and climate records.
The agency monitors global temperatures and records on a monthly and an annual basis, not daily.
"We recognise that we are in a warm period due to climate change, and combined with El Nino and hot summer conditions, we're seeing record warm surface temperatures being recorded at many locations across the globe," the statement said.
United Nations Secretary-General Antonio Guterres said the latest numbers helped prove "that climate change is out of control".
"If we persist in delaying key measures that are needed, I think we are moving into a catastrophic situation, as the last two records in temperature demonstrates," he said.
More frequent and more intense heat waves are disrupting life around the world and causing life-threatening temperatures.
In Timbuktu, Mali - at the gateway to the Sahara Desert - 50-year-old Fatoumata Arby said this kind of heat was new.
"Usually, at night it's a bit cool even during the hot season but this year, even at night, it's been hot - I've never seen anything like it," said Arby, who rarely leaves her hometown.
"I've been having heart palpitations because of the heat.
"I'm starting to think seriously that I'm going to leave Timbuktu."
Last week, Egypt experienced one of its many summer heatwaves, with temperatures soaring above 37.7C, according to the country's national weather forecaster.
To combat heat and humidity, children on Thursday frolicked in the Nile River while pedestrians hunted the shade.
People are also feeling the effects in Nouakchot, Mauritania's capital city, on the shores of the Atlantic.
For Abdallahi Sy, a 56-year-old farmer who works in the market gardens, environmental changes have reduced his already meagre income.
"I have a small shelter built from wooden poles and scraps of cloth," said Sy, who tries to work from 6am to 11am.
"I take refuge there when the heat becomes unbearable."
He cited a scarcity of water and quality feed for livestock as causes for illness and even miscarriage among animals.
"It is clear that we are facing profound changes in our environment," he said.
"The earth is becoming less fertile and less generous."
Overall, one of the largest contributors to this week's heat records is an exceptionally mild winter in the Antarctic.
Parts of the continent and nearby ocean were 10C to 20C higher than averages from 1979 to 2000.
"Temperatures have been unusual over the ocean and especially around the Antarctic this week because wind fronts over the Southern Ocean are strong pushing warm air deeper south," said Raghu Murtugudde, professor of atmospheric, oceanic and earth system science at the University of Maryland and visiting faculty at the Indian Institute of Technology, Bombay.
Chari Vijayaraghavan, a polar explorer and educator who has visited the Arctic and Antarctic regularly for the past 10 years, said global warming was obvious at both poles.
He said it threatened the region's wildlife and was driving the ice melt that raises sea levels.
"Warming climates might lead to increasing risks of diseases such as the avian flu spreading in the Antarctic that will have devastating consequences for penguins and other fauna in the region," Vijayaraghavan said.
Katharine Hayhoe, The Nature Conservancy chief scientist and a climate scientist at Texas Tech, said decisive action was needed to achieve net zero.
"This is one more reminder of the inexorable upward trend that will only be halted by decisive actions to wean ourselves off fossil fuels, invest in nature, and achieve net zero," she said.
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Mitch Marsh has celebrated his Test return with a thunderous century at Headingley, before taking a late wicket to leave the third Ashes match in the balance after day one.
Called in for his first Test since the 2019 Ashes after Cameron Green pulled up sore from Lord's, Marsh hit a-run-a-ball 118 in Australia's 263 before England reached 3-68 at stumps.
Pat Cummins also claimed two scalps for Australia on a day when all 13 wickets fell to quicks, and England's Mark Wood took 5-34 while bowling at speeds of up to 155km/h.
Sent in to bat, Australia were in early trouble at 4-85 before Marsh made a statement with his 102-ball century.
The West Australian set the tone when he cover-drove Stuart Broad (2-58) to get off the mark and later pulled Wood for six.
Marsh hit 21 boundaries in his knock, driving with incredible power, pulling three sixes high over the legside and belting another one down the ground.
Such was the 31-year-old's strike power, the usually free-flowing Head was made to look incredibly slow with his 39 from 74 balls.
Marsh went to 99 by whacking Moeen Ali back down the ground for six and scurried through for a quick single off the next ball to reach his third Test century.
"There are always times when you spend a lot of time away from the game where you think that you might not get back to Test level," Marsh said.
"It's taken a lot of hard work.
"I chose to have ankle surgery and miss last summer to get on this tour, knowing that I was going to be Greeny's understudy. Really proud to be able to get back in this team.
"I feel a part of the squad even though I haven't played a lot of Test cricket over the last couple of years. I feel very much part of it.
"It's a credit to the leadership. That's why we've had a lot of guys come in and contribute at different times and certain guys play unbelievably well."
The allrounder's century will immediately pile pressure on selectors to keep him in the team as Green is expected to overcome a minor hamstring strain before the next Test at Old Trafford.
Marsh and Head's 155-run partnership would also have been of great frustration for the hosts, who had chances to remove Head on nine and Marsh on 12.
But as has been the problem for the hosts all series they were unable to hold onto the regulation chances with Jonny Bairstow and Joe Root the culprits this time.
Marsh was finally taken when he inside-edged a ball from Chris Woakes (3-73) onto his thigh pad that was caught at second slip, sparking a collapse of 6-23.
Wood was the chief destroyer taking 4-4 in 14 balls to clean up the tail after earlier clean bowling Usman Khawaja.
But again England missed the chance to capitalise when Cummins had Ben Duckett out trying to cut a ball close to his body and Harry Brook edge one.
Marsh then capped his day by claiming Zak Crawley's edge on 33, before Root (19) and Bairstow (1) got through to the close for England.
"The game is pretty evenly poised, one or two wickets tomorrow and we're right in it," Marsh said.
England must win this Test to stay in the Ashes. A draw for Australia will retain the urn and a victory secure their first series success in England since 2001.
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There is a new explanation of why Australia's unique marsupials such as the kangaroo and koala never made it to Asia, whereas other species were successful in travelling from north to south.
Biologists have long described an invisible boundary separating Australia, New Guinea and parts of Indonesia from continental South-East Asia.
Wallace's Line is a hypothetical divider used to mark an uneven distribution of Australian and Asian creatures.
"If you travel to Borneo, you won't see any marsupial mammals, but if you go to the neighbouring island of Sulawesi you will," says Alex Skeels, from the Australian National University.
"Australia, on the other hand, lacks mammals typical of Asia, such as bears, tigers or rhinos."
The uneven distribution of animal species is partly due to a change in ancient plate tectonics dating back 45 million years, ultimately leading to a continental collision, Dr Skeels says.
He is part of a major study led by biologists at ANU and ETH Zurich in Switzerland, providing an explanation for why kangaroos and koalas aren't found in Indonesia, but many groups of animals that originated in Asia, such as goannas, rodents and kookaburras, are in Australia.
"About 35 million years ago, Australia was located much further south and was connected to Antarctica," Dr Skeels said.
"At some point in earth's timeline, Australia broke away from Antarctica and over millions of years drifted north, causing it to crash into Asia.
"That collision gave birth to the volcanic islands that we now know as Indonesia."
The islands of Indonesia served as "stepping stones" for animals and plants that originated in Asia to reach New Guinea and northern Australia, and vice versa.
"Our research shows far more groups of Asian fauna crossed over and established themselves in Australia than in the opposite direction," Dr Skeels said.
But the shifting landforms only partially explain the migration of Asian species to Australia.
When the Great Southern Land made its break from Antarctica, there was a climatic shift leading to a trend of global cooling and drying of the continents, resulting in mass extinction events around the world.
Despite the mass cooling, the climate on the Indonesian islands remained relatively warm, wet and tropical, Dr Skeels says.
Asian animals were already comfortable with such conditions, which helped them settle in Australia.
It was a different story for Australia's unique wildlife.
"They had evolved in a cooler and increasingly drier climate over time and were therefore less successful in gaining a foothold on the tropical islands compared to the creatures migrating from Asia," Dr Skeels says.
The researchers analysed a data-set of about 20,000 birds, mammals, reptiles and amphibians to determine which species hopped between Indonesia and Australia, and which ones were able to successfully adapt to their new home.
Dr Skeels says the findings could help predict which species are better positioned to adapt to new environments as climate change continues to impact global biodiversity patterns.
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Queensland state school students will be banned from using mobile phones and smartwatches when classes begin next year.
Education Minister Grace Grace says the move builds on previous policy under which almost all state schools had imposed some kind of mobile phone ban.
"This statewide ban will provide uniformity, extend bans to break times, and include certain wearable devices like smartwatches," she said in a statement on Thursday night.
Ms Grace said more than 95 per cent of schools had a clear policy banning phone use during class, with the remaining schools restricting usage informally.
Following the implementation of recommendations from the Anti-Cyberbullying 2018 Taskforce, all state schools have been required to outline how they manage mobile phones.
This includes in the context of cyberbullying and distractions in the classroom.
The Queensland government appointed former family and child commissioner Cheryl Vardon to review the current policy, with her report due later this month.
But she has already advised one of the core recommendations is to implement statewide restrictions on access to mobile phones and certain other devices during school hours, with implementation depending on the school.
For example, a small school in the outback may require students to hand phones in to a nominated staff member, while a school with thousands of students may choose to use lockable pouches.
Ms Grace said she would continue talks with other education ministers on producing consistent guidelines across states and territories.
Students will still be able to bring phones to school so they can contact parents or carers immediately before or after school.
Exemptions will also be available in specific circumstances including for health and wellbeing.
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