Iran shut primary schools in the capital and other parts of the country on Sunday due to choking levels of air pollution.

Last year's global heat record, extreme heat in Asia and unusually warm waters off the coast of Alaska happened purely because the planet is getting warmer due to human activities like burning fossil fuels, a study has said.

The findings mark the first time that global scientists have identified severe weather that could not have happened without climate change, said the peer-reviewed report titled "Explaining Extreme Events in 2016 from a Climate Perspective."

The EU must make Britain's air industry sign up to the bloc's environment rules if it wants to keep access to European skies after Brexit, a campaign group warned in a report Wednesday.

Brexit must work for animals too, Britain's Environment Secretary Michael Gove said Tuesday, promising that welfare standards would improve after leaving the European Union.

More than 50 world leaders are gathering in Paris for a summit that President Emmanuel Macron hopes will give new momentum to the fight against global warming, despite U.S. President Donald Trump's rejection of the Paris climate accord.

Some 3,100 security personnel are fanned out around Paris for Tuesday's event, including extra patrol boats along the Seine River. Macron will accompany the visiting leaders to the summit site on a river island by boat.

Snow and wintry weather are still wreaking havoc on travelers in Britain, with flights cancelled, roads sheathed in ice and rail travel disrupted.

With temperatures dropping overnight as low as minus 11.6 Celsius (11 degrees Fahrenheit), hundreds of schools were closed Monday. Europe's largest airport, Heathrow, warned Monday that some flights would be cancelled as it cleared the backlog of flights delayed by Sunday's snowfall.

Firefighters on Thursday battled raging wildfires across southern California that have forced tens of thousands of people to flee their homes, including residents on the outskirts of Los Angeles, America's second-largest city.

Winds with hurricane-force gusts of up to 80 miles per hour (130 kilometers per hour) fueled the blazes, creating apocalyptic scenes of hillsides engulfed in billowing smoke and towering plumes of flame.

The U.N.'s forecast for global warming is about 15 percent too low, which means end-of-century temperatures could be 0.5 degrees Celsius higher than currently predicted, a study has said.

As New Delhi and other major cities hit new toxic smog peaks, the United Nations sounded the alarm Wednesday over the damage that pollution is doing to babies' developing brains.

Gently, Kenzo the sea turtle is lowered onto a beach where a scattering of bottle caps, candy wrappers, yoghurt cups and discarded flipflops scar an otherwise idyllic setting.

As its human handlers step aside, Kenzo struggles out of the harness, pushes hard with its flippers on the sand, and slides into small waves specked with bits of plastic trash.