Here’s what you need to know: Video transcript Back transcript Southern California Battles Fires The wildfires in California have continued to spread, and forced evacuations in Los Angeles County. It was way down to the east, and I wasn’t worried about it. And all of a sudden it just came across without any wind. I couldn’t believe it. The wildfires in California have continued to spread, and forced evacuations in Los Angeles County.CreditCredit...Eric Thayer for The New York Times On the West Coast, leaders plead for ‘all the help we can get.’ The wildfires raging on the West Coast became an all but inescapable crisis around the country on Tuesday, with at least 27 people dead in three states, fires and evacuations starting in Idaho, milky smoke clouding the skies over Michigan and haze reaching as far as New York City. In the states where the fires are burning worst — with more than five million acres charred so far in Oregon, California and Washington State — the authorities were trying to adapt to a disaster with no clear end in sight, under conditions deeply exacerbated climate change. The Bay Area, under a choking blanket of smoke for four weeks, set another record for consecutive warnings about hazardous air. The Oregon State Police established a mobile morgue as teams searched incinerated buildings for survivors and the dead. Alaska Airlines suspended flights out of Portland, Ore., and Spokane, Wash., citing “thick smoke and haze.” And Gov. Kate Brown of Oregon requested a presidential disaster declaration, saying late Monday, “to fight fires of this scale, we need all the help we can get.” Gov. Gavin Newsom of California met with President Trump on Monday in McClellan Park, near Sacramento, thanking him for federal help and agreeing that forest management could be better — while also noting that only 3 percent of land in California is under state control, compared to 57 percent under federal control. The governors of all three states stressed that climate change had made fires more dangerous, drying forests with rising heat and priming them to burn, science that on Monday the president denied. “The rules of fighting wildfires are changing because our climate is changing,” Gov. Jay Inslee of Washington wrote in an open letter on Monday. “There is no fire suppression plan on this planet that does anyone any good if it doesn’t even acknowledge the role of climate change.” Addressing Mr. Trump directly, he wrote, “I hope you had an enlightening trip to the West Coast, where your refusal to address climate change — and your active steps to allow even more carbon pollution — will accelerate devastating wildfires like you are seeing today.” Firefighters continued trying to contain the dozens of fires on Tuesday morning. In California, the August Complex fire, which has burned more than 750,000 acres northwest of Sacramento, was contained to about 30 percent, and the Creek Fire northeast of Fresno, which has burned more than 200,000 acres, was contained about 16 percent. In Oregon, tens of thousands of people were still under evacuation orders and the Beachie Creek fire, east of Salem, grew to burn almost 200,000 acres. Lighter winds are forecast in California and Oregon, which should aid firefighters. ImageFirefighters battle the Bobcat Fire in Arcadia, Calif. on Monday.Credit...Eric Thayer for The New York Times With dozens of fires burning through millions of acres in Oregon and California, meteorologists are keeping watch on how the winds and humidity could affect efforts to battle them. While strong wind gusts are still possible, forecasters said that regions with some of the most destructive fires would benefit from gentler winds on Tuesday. Nearly three dozen fires have burned through more than 950,000 acres in Oregon. In California, the North Complex fire of more than 264,000 acres has been 39 percent contained, while the August Complex fire has raged across 755,000 acres, only 30 percent contained. On Tuesday, winds are expected to ease but smoke and haze will continue to blanket the sky over Northern California, the National Weather Service said. Temperatures will waver between the low 70s to mid-80s in the valley and the North Complex fire region. “There won’t be much wind over that fire area today,” Jim Mathews, a National Weather Service meteorologist said. “I don’t think there would be adverse conditions.” Humidity will be in the teens to low 20s, he said. “We should see an improvement,” Mr. Mathews added. “More sunshine will be filtering through the smoke and that is due to the southwest flow beginning to stir the atmosphere. But the air quality is still forecast to be unhealthy.” In Oregon, a “red flag” warning of dangerous fire conditions remained in effect east of the Cascades, and there was little moisture in the air. But most of the larger fires in the state are burning west of the mountains and the firefighters battling them were expected to be spared the higher winds. “The strongest winds I have west of the Cascades is generally gusts of around 15 miles per hour today,” said Charles Smith, a National Weather Service meteorologist in Oregon. But east of the Cascades, there will be higher winds and low humidity, making conditions “more dangerous than usual,” Mr. Smith said. “If there are any new fires they will have a problem in their initial attack,” he added, referring to firefighting. Idaho is fighting several fires, with one devouring about 70,000 acres. In Idaho, hundreds of firefighters continue to battle more than a dozen fires burning in steep, dry forests and shrublands. The largest blaze, the Woodhead Fire, grew to nearly 70,000 acres Monday, forcing the evacuation of about 40 campers and residents in the sparsely populated patchwork of grazing land and National Forest near the Oregon border. None of the state’s fires compare in size to the megafires ravaging the West Coast, but with resources stretched thin and forecasts calling for continued dry weather, local fire teams were keeping a wary eye on the blazes. On Tuesday, calm winds slowed the Woodhead Fire’s spread, said Jim Mackensen, a Forest Service spokesman. But, he cautioned, “It’s still chugging away. The winds don’t have to be there, we have such extremely dry conditions that the fire can spread fine on its own.” Several counties in the state are cloaked in smoke from fires on the coast, prompting the Idaho Department of Environmental Quality to issue warnings about unhealthy air for much of the state. As Trump again rejects science, Biden calls him a ‘climate arsonist.’ Video transcript Back transcript ‘Climate Change Is Real,’ Newsom Tells Trump at Briefing During a meeting with local and state wildfire officials in California, Gov. Gavin Newsom politely disagreed with President Trump’s view on climate change. “Your administration just entered into a first-of-its-type commitment over the next 20 years to double our vegetation management and forest management.” “Right.” “I want to thank you for supporting that effort, funding that effort. We acknowledge our role and responsibility to do more in that space. But one thing is fundamental: 57 percent of the land in this state is federal forest land. Three percent is California. So we really do need that support. We need that emphasis of engagement. And we are fully committed to working with you to advance that cause. We’ve known each other too long, and as you suggest, the working relationship I value — we obviously feel very strongly that the hots are getting hotter. The dries are getting drier. When we’re having heat domes, the likes of which we’ve never seen in our history: The hottest August ever in the history of the state, the ferocity of these fires, the drought — five-plus years — losing 163 million trees to that drought. Something’s happened to the plumbing of the world. And we come from a perspective, humbly, where we submit the science is in and observed evidence is self-evident that climate change is real, and that is exacerbating this. And so I think there is an area of, at least, commonality on vegetation, forest management. But please respect — and I know you do — the difference of opinion out here as it relates to this fundamental issue, on the issue of climate change.” “Absolutely.” “Appreciate it, thanks.” During a meeting with local and state wildfire officials in California, Gov. Gavin Newsom politely disagreed with President Trump’s view on climate change.CreditCredit...Doug Mills/The New York Times With wildfires raging across the West, climate change took center stage in the race for the White House on Monday as former Vice President Joseph R. Biden Jr. called President Trump a “climate arsonist” while the president said that “I don’t think science knows” what is actually happening. A day of dueling appearances laid out the stark differences between the two candidates, an incumbent president who has long scorned climate change as a hoax and rolled back environmental regulations and a challenger who has called for an aggressive campaign to curb the greenhouse gases blamed for increasingly extreme weather. Mr. Trump flew to California after weeks of public silence about the flames that have forced hundreds of thousands of people from their homes, wiped out communities and forests, burned millions of acres, shrouded the region in smoke and left at least 27 people dead. But even when confronted by California’s governor and other state officials, the president insisted on attributing the crisis solely to poor forest management, not climate change. Mr. Biden, for his part, assailed Mr. Trump’s record on the climate, asserting that the president’s inaction and denial had fed destruction, citing not just the current emergency on the West Coast but flooding in the Midwest and hurricanes along the Gulf Coast. In an outdoor speech at a museum in Wilmington, Del., the Democratic presidential nominee sought to paint a second Trump term as a danger to the nation’s suburbs, flipping an attack on him by the president. “If we have four more years of Trump’s climate denial, how many suburbs will be burned in wildfires?” Mr. Biden asked. “How many suburban neighborhoods will have been flooded out? How many suburbs will have been blown away in superstorms? If you give a climate arsonist four more years in the White House, why would anyone be surprised if we have more of America ablaze?” This is how will climate migration will reshape America. The Ranch 2 wildfire near the San Gabriel Canyon in California evokes the fear driving people to consider relocating.Credit...Meridith Kohut for The New York Times As wildfires burned near his home in Northern California, the climate reporter Abrahm Lustgarten asked himself: Was it finally time to leave for good? For years, many Americans had avoided confronting the increasing environmental dangers in their own backyards: fires, hurricanes, extreme heat, rising seas. But this year felt different. Would others finally wake up to how climate change was about to transform their lives? Would they start to relocate? And if so, was it possible to project where we might go? To answer these questions, he interviewed more than four dozen experts: economists and demographers, climate scientists and insurance executives, architects and urban planners, and mapped out the danger zones that will close in on Americans over the next 30 years. What he found was a nation on the cusp of a great transformation. Across the United States, some 162 million people — nearly one in two — will most likely experience a decline in the quality of their environment, namely more heat and less water. For 93 million of them, the changes could be particularly severe, and by 2070, analysis suggests, if carbon emissions rise at extreme levels, at least four million Americans could find themselves living at the fringe, in places decidedly outside the ideal niche for human life. Then what? One influential 2018 study, published in The Journal of the Association of Environmental and Resource Economists, suggests that one in 12 Americans in the Southern half of the country will move toward California, the Mountain West or the Northwest over the next 45 years because of climate influences alone. Such a shift in population is likely to increase poverty and widen the gulf between the rich and the poor. Lakefront cottages are reduced to ash in a California community. An undamaged cabin on Lake Madrone, where about half of the California region’s 130 houses were destroyed by the Bear Fire.Credit...Peter Dasilva/EPA, via Shutterstock The North Complex Fire tore through the tiny California mountain community of Lake Madrone last week, reducing the pine-fringed shore, which was speckled with cottages and frequented by bears and otters, to bare black timbers and ash. The community had spent years clearing fire breaks and removing forest debris to protect it from wildfire. But roaring winds, high temperatures and a fire storm that raced almost 20 miles in a few days smashed its defenses late last week and destroyed about half of the 130 houses. “We hoped we had done enough,” said Scott Owen, a resident who lived by the lake. “After watching that fire I don’t think you can do enough. This fire moved like no one had seen before.” On Monday evening, Sheriff Kory Honea of Butte County announced one additional victim of the fire, which has killed at least 15 people. He said that family members of some of those who died told deputies that the individuals had packed their bags and planned to evacuate, but changed their minds based on false information that the fire was 50 percent contained. Mr. Owen’s whole neighborhood burned to the ground in the blaze. One neighbor barely escaped, he said, and sheltered from the flames in a creek. On Monday the neighbors were still trying to account for everyone, hoping that authorities would not have to search the debris with cadaver dogs. Though the flames have moved north, the residents of Lake Madrone have not been able to return yet. Mr. Owen, who has owned a house on the lake for decades, said he was not sure he would rebuild. “I just think things have changed and we’re going to have more fires,” he said. “This is a record year — who knows where it goes from here.” Reporting was contributed by Peter Baker, Lisa Friedman, Christine Hauser, Thomas Kaplan, Dave Philipps and Alan Yuhas.