A vast blanket of seaweed about 5,000 miles across is threatening beaches along the Gulf of Mexico and the Caribbean.
Visible from space, the so-called Great Atlantic Sargassum Belt is believed to have some benefits, including serving as a habitat for certain fish and crustaceans and absorbing carbon dioxide.
But ocean currents are now pushing tonnes of the seaweed on to beaches, causing big problems.
There it can choke corals, wreak havoc on coastal ecosystems and diminish water and air quality as it rots.
Brian LaPointe, a research professor at Florida Atlantic University’s Harbour Branch Oceanographic Institute, told NBC: “It’s incredible.
“What we’re seeing in the satellite imagery does not bode well for a clean beach year.”
Mr LaPointe, who has studied Sargassum for four decades, said huge piles typically come ashore in South Florida in May, but beaches in Key West are already being inundated with algae.
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Parts of Mexico’s Yucatan Peninsula, including Cancun, Playa del Carmen and Tulum, are preparing for up to three feet of Sargassum to build up in the coming days.
“Even if it’s just out in coastal waters, it can block intake valves for things like power plants or desalination plants, marinas can get completely inundated and boats can’t navigate through,” Brian Barnes, an assistant research professor at the University of South Florida’s College of Marine Science said.
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“It can really threaten critical infrastructure.”
Image: Workers clear Sargassum along Punta Piedra beach in Mexico in 2018
Last summer, the US Virgin Islands declared a state of emergency after unusually high quantities of sargassum caused water shortages on St Croix.
Mr Barnes and his University of South Florida colleagues use NASA satellite data to map the Great Atlantic Sargassum Belt and its movements.
The bloom’s size in recent years would have been inconceivable decades ago, he said.
“Historically, as far back as we have records, Sargassum has been a part of the ecosystem, but the scale now is just so much bigger.
“What we would have thought was a major bloom five years ago is no longer even a blip.”
Donald Trump has said there are “many points” he and Vladimir Putin agreed on after holding critical talks on the war in Ukraine – but no deal has been reached yet.
Following the much-anticipated meeting in Alaska, which lasted more than two-and-a-half hours, the two leaders gave a short media conference giving little detail about what had been discussed, and without taking questions.
Mr Trump described the meeting as “very productive” and said there were “many points that we agreed on… I would say a couple of big ones”.
There are a few left, he added. “Some are not that significant. One is probably the most significant, but we have a very good chance of getting there…
“We haven’t quite got there, we’ve made some headway. There’s no deal until there’s a deal.”
Mr Putin described the negotiations as “thorough and constructive”, and said Russiawas “seriously interested in putting an end” to the war in Ukraine. He also warned Europe not to “torpedo nascent progress”.
Image: Donald Trump greets Vladimir Putin at Joint Base Elmendorf-Richardson, Alaska. Pic: AP/ Julia Demaree Nikhinson
After much build-up to the summit, it was ultimately not clear whether the talks produced meaningful steps towards a ceasefire in what has been the deadliest conflict in Europe in 80 years.
Mr Trump said he intended to speak with Ukrainian President Volodymyr Zelenskyy and other European leaders, who were excluded from the discussions, to brief them.
The news conference came after a grand arrival earlier in the day at the Elmendorf-Richardson military base in Anchorage, where the US president stepped down from Air Force One and later greeted his Russian counterpart with a handshake and smiles on a red carpet.
Mr Putin even travelled alongside Mr Trump in the presidential limousine, nicknamed “The Beast”.
It was the kind of reception typically reserved for close US allies, belying the bloodshed and the suffering in the war.
Before the talks, the two presidents ignored frantically-shouted questions from journalists – and Mr Putin appeared to frown when asked by one reporter if he would stop “killing civilians” in Ukraine, putting his hand to his ear as though to indicate he could not hear.
Our US correspondent Martha Kelner, on the ground in Alaska, said he was shouting “let’s go” – apparently in reference to getting the reporters out of the room.
This breaking news story is being updated and more details will be published shortly.
For Ukrainians, the spectacle of Vladimir Putin and Donald Trump meeting in Alaska will be repugnant.
The man behind an unprovoked invasion of their country is being honoured with a return to the world stage by the leader of a country that was meant to be their ally.
President Trump had threatened severe sanctions on Russia within 50 days if Russia didn’t agree to a deal. He had seemed close to imposing them before letting Putin wriggle off the hook yet again.
But they are not surprised. At every stage, Trump has either sided with Russia or at least given them the benefit of the doubt.
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3:44
‘Putin won’t mess around with me’
It is clear that Putin has some kind of hold over this American president, in their minds and many others.
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Ukraine wants three things out of these talks. A ceasefire, security guarantees and reparations. It is not clear at this stage that they will get any of them.
Ukrainians and their European allies are appalled at the naive and cack-handed diplomacy that has preceded this meeting.
Vladimir Putin is sending a team of foreign affairs heavyweights, adept at getting the better of opponents in negotiations.
There are, the Financial Times reported this week, no Russia specialists left at the Trump White House.
Instead, Trump is relying on Steve Witkoff, a real estate lawyer and foreign policy novice, who has demonstrated a haphazard mastery of his brief and breathtaking credulity with the Russians.
Former British spy chief Sir Alex Younger described him today as totally out of his depth. Trump, he says, is being played like a fiddle by Putin.
There is a fundamental misunderstanding of the conflict at the heart of the Trump administration’s handling of it. Witkoff and the president see it in terms of real estate. But it has never been about territory.
Vladimir Putin has made it abundantly clear that Ukraine’s existence as a sovereign democratic entity cannot be tolerated. He has made no pretence that his views on that have changed.
Ukrainians know that and fear any deal cooked up in Alaska will be used by Putin on the path towards that ultimate goal
Melania Trump has threatened to sue Hunter Biden for more than $1bn (£736.5m) in damages if he does not retract comments linking her to Jeffrey Epstein.
Mr Biden, who is the son of former US president Joe Biden, alleged in an interview this month that sex trafficker Epstein introduced the first lady to President Donald Trump.
“Epstein introduced Melania to Trump. The connections are, like, so wide and deep,” he claimed.
Ms Trump’s lawyer labelled the comments false, defamatory and “extremely salacious” in a letter to Mr Biden.
Image: Hunter Biden. File pic: AP
Her lawyer wrote that the first lady suffered “overwhelming financial and reputational harm” as the claims were widely discussed on social media and reported by media around the world.
The president and first lady previously said they were introduced by modelling agent Paolo Zampolli at a New York Fashion Week party in 1998.
Mr Biden attributed the claim that Epstein introduced the couple to author Michael Wolff, who was accused by Mr Trump of making up stories to sell books in June and was dubbed a “third-rate reporter” by the president.
The former president’s son doubled down on his remarks in a follow-up interview with the same YouTube outlet, Channel 5 with Andrew Callaghan, entitled “Hunter Biden Apology”.
Asked if he would apologise to the first lady, Mr Biden responded: “F*** that – that’s not going to happen.”
He added: “I don’t think these threats of lawsuits add up to anything other than designed distraction.”
Ms Trump’s threat to sue Mr Biden echoes a strategy employed by her husband, who has aggressively used legal action to go after critics.
Public figures like the Trumps must meet a high bar to succeed in a defamation suit like the one that could be brought by the first lady if she follows through with her threat.
In his initial interview, Mr Biden also hit out at “elites” and others in the Democratic Party, who he claims undermined his father before he dropped out of last year’s race for president.
This comes as pressure on the White House to release the Epstein files has been mounting for weeks, after he made a complete U-turn on his administration’s promise to release more information publicly.
The US Justice Department, which confirmed in July that it would not be releasing the files, said a review of the Epstein case had found “no incriminating ‘client list'” and “no credible evidence” the jailed financier – who killed himself in prison in 2019 – had blackmailed famous men.