While lightning strikes grab headlines by causing thousands of wildfires, the startling truth is that nearly nine out of every ten blazes are ignited by us.
Key Takeaways
- Lightning strikes ignited 2,390 wildfires in the United States in 2023, representing 12.5% of all reported wildfire ignitions that year.
- Human activities, including debris burning, caused 16,591 wildfires in the US in 2023, accounting for 87.5% of total ignitions.
- Campfires were responsible for 4.5% of wildfire starts in California between 2001-2020, per CAL FIRE data.
- In 2022, the US experienced 63,542 wildfires, up 12% from the 10-year average.
- Canada reported 6,658 wildfires in 2023, nearly double the 2001-2022 average of 3,658.
- Australia saw 18,000 wildfires in the 2019-2020 season, 50% above average.
- The US had wildfires on 4.3 million acres in 2023, 20% below average but with large fires dominating.
- Australia's 2019-2020 fires burned 18.6 million hectares, 50 times the annual average.
- Canada's 2023 wildfires scorched 18.5 million hectares, largest in modern records.
- Wildfires destroyed 18,000 homes in California from 2017-2020.
- The 2023 Maui fires killed 102 people and cost $5.5 billion in damages.
- US wildfires caused $20 billion in insured losses in 2020 alone.
- Wildfires emit 8 billion tons CO2 yearly, 25% of human emissions.
- 2019-2020 Australian fires released 830 Mt CO2 equivalent.
- Boreal forest fires release 40% more CO2 than tropical per area.
Most wildfires are started by humans, but lightning also causes a significant number.
Causes
1Lightning strikes ignited 2,390 wildfires in the United States in 2023, representing 12.5% of all reported wildfire ignitions that year.
Verified2Human activities, including debris burning, caused 16,591 wildfires in the US in 2023, accounting for 87.5% of total ignitions.
Verified3Campfires were responsible for 4.5% of wildfire starts in California between 2001-2020, per CAL FIRE data.
Verified4Equipment use sparked 21% of wildfires on US federal lands from 2000-2017.
Directional5Arson accounted for 8% of wildfire ignitions in Australia during the 2019-2020 Black Summer fires.
Single source6Power lines caused 11% of wildfires in California from 2013-2022, leading to major events like the Dixie Fire.
Verified7Smoking materials ignited 3.2% of US wildfires annually averaged from 2010-2022.
Verified8Children and arsonists under 18 started 14% of structure fires that spread to wildfires in the US in 2021.
Verified9Volcanic activity rarely causes wildfires but did so in 1% of Iceland's fires from 1950-2020.
Directional10Railroad sparks accounted for 2.1% of wildfires in Canada from 2015-2020.
Single sourceCauses Interpretation
While lightning may be the dramatic villain in the wildfire story, it turns out we humans are the clumsy, prolific, and often inattentive co-authors of most of our own fiery destruction.
Environmental
1Wildfires emit 8 billion tons CO2 yearly, 25% of human emissions.
Verified22019-2020 Australian fires released 830 Mt CO2 equivalent.
Verified3Boreal forest fires release 40% more CO2 than tropical per area.
Verified4Wildfires destroy 80 million trees annually in US national forests.
Directional5Amazon fires reduced rainfall by 10% regionally in 2019.
Single source6Post-fire erosion increases sediment yield by 100-1000 times.
Verified7Wildfires kill 50% of soil microbes, delaying recovery 5-10 years.
Verified82023 Canadian fires released 640 Mt CO2, 4x annual Canadian emissions.
Verified9High-severity fires convert forests to shrublands in 20% of CA cases.
Directional10Wildfire smoke reduces solar irradiance by 20-50% downwind.
Single source11Post-fire invasive species invade 30% of burned US areas.
Verified12Boreal permafrost thaw from fires accelerates by 50%.
Verified13Wildfires acidify soils, reducing pH by 0.5-1 unit.
Verified14Global wildfires threaten 25% of biodiversity hotspots.
DirectionalEnvironmental Interpretation
Wildfires are Earth’s own vicious circle, turning forests from carbon vaults into chimneys, crippling ecosystems with a single scorching breath and ensuring their own future with every spark.
Extent
1The US had wildfires on 4.3 million acres in 2023, 20% below average but with large fires dominating.
Verified2Australia's 2019-2020 fires burned 18.6 million hectares, 50 times the annual average.
Verified3Canada's 2023 wildfires scorched 18.5 million hectares, largest in modern records.
Verified4California's 2020 fire season burned 4.3 million acres, 4% of state land.
Directional5Amazon fires destroyed 11,088 km² of rainforest in 2019.
Single source6Siberia's 2021 fires burned 10 million hectares, 25% of Russia's annual total.
Verified7Greece's 2021 Evia fire consumed 107,000 hectares over 11 days.
Verified8Portugal's 2017 fires burned 520,000 hectares, 5% of national territory.
Verified9The 2023 Canadian fires affected 4.5 million hectares in Quebec alone.
Directional10Australia's Black Summer fires destroyed 24% of Australia's temperate broadleaf forests.
Single source11Maui's 2023 Lahaina fire burned 2,170 acres, destroying 2,200 structures.
Verified12Global burned area averaged 3.7 million km² annually from 2001-2022 per satellites.
Verified13Chile's 2024 fires (ongoing data) have burned 50,000 hectares by Feb.
Verified14Oregon's 2020 Labor Day fires scorched 1 million acres in 3 days.
DirectionalExtent Interpretation
While the U.S. sometimes dabbles in statistical moderation, the global stage is being decisively commandeered by megafires that rewrite records with a ferocity that renders percentages almost quaint.
Frequency
1In 2022, the US experienced 63,542 wildfires, up 12% from the 10-year average.
Verified2Canada reported 6,658 wildfires in 2023, nearly double the 2001-2022 average of 3,658.
Verified3Australia saw 18,000 wildfires in the 2019-2020 season, 50% above average.
Verified4California had 7,742 wildfires in 2023, compared to a 5-year average of 6,510.
Directional5Global wildfire frequency increased by 25% from 2001-2022 per MODIS satellite data.
Single source6Siberia experienced 10 million hectares burned in 2021, with 1,500+ fires active simultaneously.
Verified7Greece had 93 wildfires in 2021 summer, exceeding the 2000-2020 average by 40%.
Verified8Portugal recorded 12,000 fire events in 2022, 20% more than the previous decade's mean.
Verified9Amazon basin saw 80,000 fire hotspots in August 2019, triple the 2018 figure.
Directional10South Africa had 1,200 wildfires in the Western Cape in 2019, 30% above seasonal norms.
Single source11The 2023 Maui wildfires consisted of 3 major fires starting within 24 hours.
Verified12Europe experienced 1,200 wildfires in July 2022 alone, per EFFIS data.
Verified13Alaska reported 587 fires in 2023 by July, 150% of average.
Verified14Chile had over 400 wildfires in early 2023, surpassing 2017 records.
Directional15India recorded 25,000 forest fire alerts in Uttarakhand 2023 summer.
Single sourceFrequency Interpretation
The planet is getting hotter and the data is screaming, “This isn’t a drill.”
Health
1Wildfire smoke exposure causes 7 million asthma attacks yearly worldwide.
Verified2PM2.5 from US wildfires increased cardiovascular deaths by 1.5% in 2020.
Verified32020 CA wildfire smoke led to 10,000 excess deaths across North America.
Verified4Firefighters have 14% higher lung cancer risk from smoke exposure.
Directional5Wildfire smoke reduces birthweight by 4g per 10µg/m³ PM2.5 exposure.
Single source6Australian 2019-20 fires caused 445 premature deaths from smoke.
Verified7Ozone from wildfires increases respiratory hospitalizations by 2-5%.
Verified830% of US population exposed to unhealthy air from 2023 Canadian fires.
Verified9Chronic wildfire smoke exposure raises dementia risk by 15%.
Directional10Children under 5 face 2x higher asthma risk from wildfire PM.
Single source112023 Maui fires caused acute respiratory issues in 1,000+ survivors.
Verified12Global wildfire PM2.5 caused 2.3 million deaths 1997-2022.
VerifiedHealth Interpretation
While it pretends to be a mere seasonal nuisance, wildfire smoke is a silent, global arsonist that is methodically setting fire to our lungs, hearts, and futures one statistic at a time.
Impacts
1Wildfires destroyed 18,000 homes in California from 2017-2020.
Verified2The 2023 Maui fires killed 102 people and cost $5.5 billion in damages.
Verified3US wildfires caused $20 billion in insured losses in 2020 alone.
Verified4Australia's 2019-2020 fires killed 33 people and 3 billion animals.
Directional5Camp Fire (2018) in CA killed 85, destroyed 18,800 structures, cost $16.5B.
Single source6Lahaina fire displaced 12,000 residents, with 97% uninsured.
Verified7US wildfire suppression costs averaged $3 billion annually 2018-2022.
Verified82023 Canadian fires evacuated 2.7 million people across provinces.
Verified9Woolsey Fire (2018) damaged 1,500 structures, cost Hollywood $42M.
Directional10Global wildfires cause 340,000 premature deaths yearly from smoke.
Single source11California's wildfires led to 4 million acres of timber loss, $10B economy hit 2018-2020.
Verified122021 Dixie Fire destroyed 1,000+ homes, cost PG&E $2.5B settlement.
Verified13US wildfires injure 7,000 firefighters annually on average.
Verified14Paradise CA rebuild post-2018 fire: only 20% homes rebuilt by 2023.
Directional15Wildfire smoke caused $800B global economic loss 2000-2018.
Single source16Europe's 2022 fires cost €3B in damages and suppression.
VerifiedImpacts Interpretation
The grim statistics of modern wildfires paint a devastating portrait of compounding tragedies, where the cost in lives, homes, and dollars is now routinely counted in the billions, revealing a global crisis that is as relentless as it is ruinous.
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