The deluge capped a summer of extreme climate events, from deadly heatwaves to wildfires. We must take action now

For millennia, the high peaks of the Himalayas were held together by an invisible, frozen cement – permafrost and glacial ice that bound ancient rock into seemingly unshakable fortresses. But as the planet continues to warm, this alpine glue is liquefying.

The glacial collapse and deluge in Nepal and Tibet was not a freak weather event; it was the structural failure of a mountain itself, nature’s latest commentary on the deadly consequences of human-caused planetary warming. And it was the exclamation point on a summer of extremes, illustrating with a sole unnatural disaster the apocalyptic future that lies in store if we fail to take dramatic climate action.

Exclusive: Michael Boren, a senior official overseeing the US Forest Service, is accused by Democratic senators of ‘inappropriate interference’

Donald Trump’s administration is facing calls to launch an investigation into allegations that Michael Boren, a senior official who oversees the US Forest Service, pressed agency staff to deploy additional resources to fight a fire burning near his Idaho ranch.

Three Democratic senators accused Boren of “inappropriate interference” in a letter seen by the Guardian, demanding answers from Brooke Rollins, US agricultural secretary. Boren serves as undersecretary of agriculture for natural resources and environment.

Tens of thousands are still under evacuation orders or warnings amid ‘human-caused’, wind-driven blaze

The Hawk fire is about 27% contained, authorities said on Monday afternoon, two days after the fast-moving, wind-driven wildfire sparked near Reno, Nevada.

Authorities added that 23,000 people are under a “go-now” order and 40,000 people are under a “get-set” warning, an improvement from the 90,000 Nevadans under evacuation orders or warnings on Monday morning.

Human-caused Hawk fire covers more than 13,000 acres as blaze approaches University of Nevada campus in Reno

A fast-moving Nevada wildfire exploded to more than 13,000 acres (5,200 hectares) on Sunday, pushing from the Sierra foothills toward the center of Reno and urging nearly 90,000 residents to evacuate as flames threatened neighborhoods and reached the edge of the University of Nevada campus.

The Hawk fire’s “GO NOW” evacuation zone had expanded to the edge of the university campus as strong, gusty winds, low humidity and dry vegetation fueled the blaze, according to Truckee Meadows Fire and Rescue in Reno. Of those urged to evacuate, 42,000 were under strict orders. An additional 45,000 people were in the evacuation warning zone, and encouraged to leave now and be prepared to stay away for several days to clear the roads for first-responders.

Pollution levels in the city were elevated as smoke from Canadian wildfires drifted south across a huge swathe of the US

The sun shone feebly through the thick haze. The smell of burning wood hung thick in the air. Many New Yorkers donned masks as the air quality plummeted amid health warnings.

The National Weather Service issued an air-quality alert because pollution levels were elevated as smoke from raging Canadian wildfires drifted south across a huge swathe of the US, reaching all the way to New York City and even beyond out into the Atlantic.

Since 2015, fires have undone years of effort to reduce ozone levels, underscoring a growing public health crisis

The highly destructive wildfires that have battered the US and North America in recent years have significantly increased emissions and been linked to tens of thousands of premature deaths, but their impact on air quality is greater than previously known, according to new research.

A study published in Science on Thursday found that, since 2015, wildfires have reversed US progress toward ozone air quality standards, as the worsening pollution caused by wildfire smoke has undone years of efforts to reduce emissions. Ground-level ozone (O3) is created when pollutants from cars, refineries and industrial sources react with sunlight, according to the Environmental Protection Agency.

Firefighters are racing to douse flames on California’s Santa Rosa Island as experts express concern for unique habitat

On the south-eastern corner of Santa Rosa Island lies a grove of a few thousand Torrey pine trees, some of them more than 250 years old. The only other place on earth where these gnarled pines exist is in San Diego county, but biologists classify the two groves as different subspecies. So when a rare wildfire broke out on Santa Rosa Island late last week, firefighters raced to keep it from spreading into the grove, where it threatened to consign the island’s Torrey pines to extinction.

So far, they appear to be succeeding – even as the 18,000-acre fire has torched nearly one-third of the island’s surface. But biologists who have studied Santa Rosa Island’s unique ecology are watching anxiously as the fire continues to burn a part of the island that is home to six plants found nowhere else on the planet.

Hundreds of firefighters continue to battle the wind-driven fire in the Simi Valley area as at least one home is destroyed

More than 17,000 people were under evacuation orders in southern California on Tuesday as a wildfire threatened suburban homes.

The wind-driven Sandy fire was reported on Monday in the hills above Simi Valley, about 30 miles (48km) north-west of Los Angeles.

Fire reported in Simi Valley, north-west of LA, as mandatory evacuation orders issued for more than 20,000 residents

A fast-growing brush fire ignited on Monday morning in southern California, prompting evacuation orders for thousands of people and damaging at least one home.

The Sandy fire was reported just after 10am in Simi Valley, a city in Ventura county about 30 miles north-west of Los Angeles.

Extreme weather likely to continue after devastating homes and endangering millions in US south and midwest

At least two people are dead after a very powerful tornado struck northern Texas on Saturday night, as extreme weather continued to devastate homes and put millions across the south and midwestern US at risk, with wildfires also raging on in parts of Georgia.

Officials from Wise county in Texas said the storm reached the area at around 10pm and caused significant damage across multiple neighborhoods. In addition to the confirmed deaths, six people were treated or transported by emergency responders to be treated for storm-related injuries.

Rising temperatures and extreme drought are driving more destructive spring fires across the Great Plains. This year, forces aligned to create the perfect storm in Nebraska

In a normal year, the vast grasslands that roll across the American Great Plains would be starting to green. But at the center of the US, where most of the nation’s beef producers graze their herds, this spring brought fire instead of moisture, leaving more than a million acres black and barren.

Multiple blazes raged across Nebraska, where the records for the annual acreage burned were obliterated in a single month. The state logged the largest blaze ever recorded when the Morrill fire cascaded across more than 642,000 acres (260,000 hectares) before it was contained in March.