Study: Prescribed burns boost giant sequoia survival in wildfires

AI digestMimile.ai EditorialJuly 21, 2026 at 10:00 PM

This digest was compiled by AI from multiple sources — links to the originals are below.

Study: Prescribed burns boost giant sequoia survival in wildfires

A new study in Nature Communications finds that giant sequoias were nearly four times more likely to survive extreme wildfires in forests managed with prescribed burns. During the record 2020-2021 fire seasons, 19% of mature sequoias were killed across California's Sierra Nevada.

Mortality Across Groves

Researchers analyzed 26,403 giant sequoias across 19 groves in Sequoia and Kings Canyon National Parks after the 2020 and 2021 fire seasons, when 6.8 million acres burned in California. The study found that 19% of the mature sequoia population was destroyed in those two years.

Remote Sensing Evidence

The team used lidar, stem maps, high-resolution imagery and modeling to estimate mortality relative to forest management. Prescribed burns saved roughly 1,800 giant sequoias, providing the first quantitative evidence for a practice previously supported only anecdotally.

Broader Conservation Implications

Giant sequoias, found only on the western slopes of California's Sierra Nevada, can exceed 300 feet in height and 30 feet in diameter. The study demonstrates the value of high-resolution remote sensing for species-specific conservation in old-growth forests worldwide.

What's Next

The findings may influence U.S. Forest Service policies on prescribed burns in sequoia groves ahead of the next fire season. It remains unclear how budget constraints and public opposition to controlled burns will affect implementation.

1 source

Study: Prescribed burns boost giant sequoia survival in wildfires

phys.org

Phys.org

Environment

Fast-moving wildfires leave too few seed trees for western North American forest recovery

Fast-moving wildfires across western North America are burning conifer forests so thoroughly that they leave too few surviving seed trees for natural recovery, according to a study published in Science Advances. Researchers from Colorado State University and Western Colorado University, with colleagues at UC Berkeley, the U.S. Forest Service and the Canadian Forest Service, analyzed nearly 3,500 wildfires from 2012 to 2023 and found that higher fire spread rates increased near-total tree mortality and widened the distance to surviving seed trees. The findings suggest many burned areas may shift to shrubland or grassland rather than returning to forest.

Science

Evolutionary cancer strategy aims to outpace drug resistance

Researchers at City St George's, University of London propose switching cancer therapies before tumors develop resistance, applying evolutionary theory to improve cure rates. Mathematical models suggest rapid, timed switches between multiple treatments could prevent relapse. The strategy targets one of oncology's biggest obstacles: drug resistance.

Science

Stanford study: extreme heat risk for elderly far higher than previous estimates

A Stanford University study finds that far more elderly people than previously estimated are at high risk of illness or death from extreme heat as climate change raises global temperatures. The researchers factored in age-related decline in the body’s ability to tolerate heat, revealing a level of risk that earlier assessments overlooked.

Environment

Study projects four extra hours of extreme heat per hot day by 2100

A modeling study published in Nature Climate Change projects that under a high-emissions scenario, hot days could gain more than four additional hours of extreme heat by 2070–2099. Low- and middle-income countries would bear over three-quarters of the increased heat exposure. Non-hot days are also projected to gain hot hours that daily temperature metrics fail to detect.

Study: Prescribed burns boost giant sequoia survival in wildfires

Mortality Across Groves

Remote Sensing Evidence

Broader Conservation Implications

What's Next

Read more

Read more