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

    You’re out of free articles.

    Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
    To continue reading
    Create a free account or sign in to unlock more free articles.
    or
    Please enter an email address
    By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
    Ideas

    The Last Time America Tried to Legislate Its Way to Energy Affordability

    Lawmakers today should study the Energy Security Act of 1980.

    Jimmy Carter.
    Heatmap Illustration/Getty Images, Library of Congress

    The past few years have seen wild, rapid swings in energy policy in the United States, from President Biden’s enthusiastic embrace of clean energy to President Trump’s equally enthusiastic re-embrace of fossil fuels.

    Where energy industrial policy goes next is less certain than any other moment in recent memory. Regardless of the direction, however, we will need creative and effective policy tools to secure our energy future — especially for those of us who wish to see a cleaner, greener energy system. To meet the moment, we can draw inspiration from a largely forgotten piece of energy industrial policy history: the Energy Security Act of 1980.

    Keep reading...Show less
    Blue
    AM Briefing

    The Grinch of Offshore Wind

    On Google’s energy glow up, transmission progress, and South American oil

    Donald Trump.
    Heatmap Illustration/Getty Images

    Current conditions: Nearly two dozen states from the Rockies through the Midwest and Appalachians are forecast to experience temperatures up to 30 degrees above historical averages on Christmas Day • Parts of northern New York and New England could get up to a foot of snow in the coming days • Bethlehem, the West Bank city south of Jerusalem in which Christians believe Jesus was born, is preparing for a sunny, cloudless Christmas Day, with temperatures around 60 degrees Fahrenheit.

    This is our last Heatmap AM of 2025, but we’ll see you all again in 2026!

    THE TOP FIVE

    1. Trump halts construction on all offshore wind projects

    Just two weeks after a federal court overturned President Donald Trump’s Day One executive order banning new offshore wind permits, the administration announced a halt to all construction on seaward turbines. Secretary of the Interior Doug Burgum announced the move Monday morning on X: “Due to national security concerns identified by @DeptofWar, @Interior is PAUSING leases for 5 expensive, unreliable, heavily subsidized offshore wind farms!” As Heatmap’s Jael Holzman explained in her writeup, there are only five offshore wind projects currently under construction in U.S. waters: Vineyard Wind, Revolution Wind, Coastal Virginia Offshore Wind, Sunrise Wind, and Empire Wind. “The Department of War has come back conclusively that the issues related to these large offshore wind programs create radar interference, create genuine risk for the U.S., particularly related to where they are in proximity to our East Coast population centers,” Burgum told Fox Business host Maria Bartiromo.

    Keep reading...Show less
    Green
    Energy

    Google Is Cornering the Market on Energy Wonks

    The hyperscaler is going big on human intelligence to help power its artificial intelligence.

    The Google logo holding electricity.
    Heatmap Illustration/Getty Images

    Google is on an AI hiring spree — and not just for people who can design chips and build large language models. The tech giant wants people who can design energy systems, too.

    Google has invested heavily of late in personnel for its electricity and infrastructure-related teams. Among its key hires is Tyler Norris, a former Duke University researcher and one of the most prominent proponents of electricity demand flexibility for data centers, who started in November as “head of market innovation” on the advanced energy team. The company also hired Doug Lewin, an energy consultant and one of the most respected voices in Texas energy policy, to lead “energy strategy and market design work in Texas,” according to a note he wrote on LinkedIn. Nathan Iyer, who worked on energy policy issues at RMI, has been a contractor for Google Clean Energy for about a year. (The company also announced Monday that it’s shelling out $4.5 billion to acquire clean energy developer Intersect.)

    Keep reading...Show less
    Yellow