Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Climate

How Invasive Plants Fueled an Inferno in Maui

“When the land gets abandoned, the grasses are the first invaders. All you need is a little drought to have a flammable landscape.”

A Hawaii landscape.
Heatmap Illustration/Getty Images

Researchers and scientists have been tracking and anticipating more frequent and larger wildfires across Hawaii for years. While the speed and scale of the wildfire that devastated Lahaina and killed at least 36 people this week was a surprise, the fact that the state, Maui, and especially the western part of the island was susceptible to fires was not.

In 2019, fire burned some 25,000 acres on the island. A government report on the 2019 fires concluded that “Wild/brush/forest fires present a growing threat to Maui County citizen safety and property. Island communities are particularly vulnerable because populations tend to be clustered and dependent on single highways, often located on the island edge,” almost directly anticipating the disaster in Lahaina.

Research by Clay Trauernicht, a fire specialist at the University of Hawaii, and others has shown that the scale and frequency of wildfires have been increasing across in Hawaii from the early 1900s to the 2010s. The researchers also identified a major culprit: non-native plants.

“Wildfires were most frequent in developed areas, but most areas burned occurred in dry non-native grasslands and shrublands that currently compose 24 percent of Hawaii’s total land cover,” the researchers wrote. “These grass-dominated landscapes allow wildfires to propagate rapidly.”

Get one great climate story in your inbox every day:

* indicates required
  • The non-native grasses were brought to Hawaii by cattle ranchers in the 19th century, University of California Santa Barbara ecologist Carla D’Antonio told me. “They were selected because they were drought tolerant.”

    They are also invasive. The abandoned sugar and pineapple farms across the state are quickly taken over by non-native grasses. “When the land gets abandoned, the grasses are the first invaders. All you need is a little drought to have a flammable landscape.” Maui is currently in a drought.

    The grasses are an especially potent fuel, D'Antonio explained, because they grow quickly when it rains and then stick around, deeply rooted into the soil, as dry, dead organic matter, becoming a “standing layer of very ignitable fuel.”

    Then after a fire, these non-native plants tend to do better than native ones, thus increasing future fire risk. Fire “has generally been shown to decrease the abundance of native woody plants because nonnative, invasive, fire-adapted plants out-compete natives for resources in the post-fire environment and tend to dominate post-fire communities,” according to a United States Forest Service review.

    These grass fires can also grow and move quickly, endangering residents and firefighters. “They see fire at a distance and the next thing they knew the building is on fire,” D’Antonio said.

    The 2021 County of Maui report recommended “reduction of alien plant life that serves as fuel,” in order to prevent future wildfires, noting that “grasses serve as tinder and rapidly invade roadside shoulders.” Fire authorities should “implement an aggressive plan to replace these hazardous fuel sources with native plants to reduce combustible fuel while increasing water retention,” the report said.

    If grasses provide the fuel for fire in Hawaii, then strong winds can help turn them into devastating wildfires, both by spreading fire and by sucking moisture into the storm and away from land.

    “People really need to think about how they live in a flammable environment,” D’Antonio said. “They’re living with a legacy that’s going to be impossible to reverse.”

    Read more about the Maui fires:

    Your Biggest Questions About the Deadly Maui Fires, Answered

    Green
    Matthew Zeitlin profile image

    Matthew Zeitlin

    Matthew is a correspondent at Heatmap. Previously he was an economics reporter at Grid, where he covered macroeconomics and energy, and a business reporter at BuzzFeed News, where he covered finance. He has written for The New York Times, the Guardian, Barron's, and New York Magazine. Read More

    Read More
    Electric Vehicles

    A Dumbphone on Wheels

    Simpler electric vehicles would not only be cheaper — they’d last longer too.

    A man charging a very old car.
    Heatmap Illustration/Getty Images

    If you haven’t heard, the dumbphone is back. Vexed by their emotionally ruinous smartphone addiction, plenty of people, including those of the tech-savvy younger generations, are turning their backs on iPhones and Androids to embrace internet-free cellphones that walked right out of the 1990s.

    The impossibility of TikTok is not the dumbphone’s only winning feature. Flagship smartphones are expensive and delicate. Despite Apple’s soft cooing about the iPhone’s beautiful facade, you must shield that design behind a plastic case at all times, lest you drop your $1,200 investment and ruin it. Dumbphones, though, are rugged and cheap. They do their job without fuss or pretense. They are an appliance, and they know it.

    Keep reading...Show less
    Blue
    Electric Vehicles

    AM Briefing: Biden’s Schedule for Offshore Wind Auctions

    On the new auction schedule, Tesla earnings, and the Mercedes G-Class EV

    Biden’s Plan to Jumpstart Offshore Wind
    Heatmap Illustration/Getty Images

    Current conditions: A Saharan dust storm turned skies red in Greece • More heavy rain is expected in China’s flooded Guangdong province • Red Flag fire weather warnings are in place across much of New Mexico.

    THE TOP FIVE

    1. Key takeaways from Tesla’s quarterly earnings report

    Tesla reported first quarter earnings yesterday. The electric car company’s profits fell 55%, and revenue fell 9%. But shares rose more than 10% in after-hours trading following the shareholder update and earnings call. Here are a few things we learned from the report:

    Keep reading...Show less
    Yellow
    Podcast

    How Jigar Shah Thinks About Risk

    Inside episode 13 of Shift Key.

    Robinson Meyer and Jigar Shah.
    Heatmap Illustration/@bendroz

    Jigar Shah might have more control over America’s new wave of industrial policy — not to mention its climate policy — than anyone not named Joe Biden. And he’s not even a Cabinet-level official. As director of the Department of Energy’s Loan Programs Office, which is akin to its in-house bank, Shah oversees how roughly $400 billion in lending authority will be spent. That money will help finance new EV factories, geothermal wells, carbon capture sites, and more.

    On this week’s episode, Rob sits down with Shah to discuss the philosophy that he brings to his role. When financing new projects — many of which are the first of their kind — how does he think about cash flow, about technological innovation, about risk? Robinson Meyer is executive editor of Heatmap News; Jesse Jenkins, an energy systems engineering professor at Princeton, is off this week.

    Keep reading...Show less
    Green