Why huge wildfires are the 'new normal'

California's Rim Fire has scorched 281 square miles, making it the seventh biggest wildfire in the state's history. And the blaze is still only 20 percent contained, so firefighters warn its toll will only get worse.

"It's burning its way into the record books," Daniel Berlant, a spokesman for the California Department of Forestry and Fire Protection, tells the Los Angeles Times.

The fire has blackened tens of thousands of acres in Yosemite National Park, threatened to disrupt water and power supplies to San Francisco, and destroyed 111 buildings, despite the efforts of 3,700 firefighters to bring it under control.

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There is something even scarier than the massive fire's path of destruction, though. Fire and forestry experts say that a host of factors are conspiring to make this kind of massive blaze far more common in the future.

"This is the new normal," Don Wuebbles, a professor of Atmospheric Sciences at the University of Illinois, tells National Geographic. "If we look at how the climate has changed over the past 50 years — with warmer temperatures increasing beyond what we used to see in the early part of the 20th century, and changes in precipitation — fires will continue to happen and get worse and worse."

United States Forest Service Chief Thomas Tidwell testified in a June Senate hearing that the average wildfire burns twice as much land today as it did 40 years ago. In the last decade, 10 states have experienced their worst fires ever, and the cost of fighting fires has jumped from $1.1 billion in 1994 to $2.7 billion in 2011. Warmer weather is also causing fires to burn over a bigger chunk of the year. "The line separating "fire season" from the rest of the year is becoming blurry," says Osha Gray Davidson at Rolling Stone.

One reason is that the snowpack that provides moisture in the West's mountains is diminishing as temperatures rise — one study says the snowfall levels in mountains near Los Angeles are likely to drop by up to 40 percent below 2000 levels in the next four decades. "On the fire lines, it is clear," fire geographer Michael Medler said in a 2007 congressional hearing, according to Rolling Stone. "Global warming is changing fire behavior, creating longer fire seasons and causing more frequent, large-scale, high-severity wildfires."

But climate change is not the only reason monster fires are getting more common. Here's Bryan Walsh at TIME:

If aggressively fighting wildfires helps fuel build up, why do it? That's an easy one. More and more people are moving into remote parts of the Southwest where forest fires are a part of life, both increasing the frequency of man-made fires and multiplying the number of structures and lives at stake when the woods go up in flames. According to estimates by the investigative-journalism group I-News, cited by TIME, a quarter-million people have moved into Colorado's fire-prone red zones alone over the last two decades.

The potential for disaster was made clear this year, when 19 members of the Granite Mountain Hotshots (one of the nation's 110 elite forest-fire units) were killed in the Yarnell Hill Fire in Arizona — the deadliest day for wilderness firefighters since 1933.

Tom Harbour, director of the Forest Service's Fire and Aviation Management program, tells Rolling Stone that the buildup of fuels caused by years of aggressive fire suppression has created a dangerous new wildfire reality. Here's how he puts it: "The situation today is like taking a football field, soaking the bleachers with gasoline, lighting it on fire and then dropping a Hotshot crew in the middle and expecting them to put it out."