An area larger than England has burned in BC and Alberta since 2000

The animation above plots every fire perimeter mapped by the BC Wildfire Service and Alberta Wildfire from January 2000 through December 2025. Each fire appears in the month it ignited and stays on the cumulative map. By the end of 2025 the perimeter record adds up to 20.34 million hectares. When this article first ran it put the figure at 18.36 million, drawn from the national database, and noted that the provinces' own totals implied a real number above 20 million. Rebuilding the map directly from the provincial files — and clipping every perimeter to the BC and Alberta boundary so cross-border burn is not counted — landed almost exactly there. That is larger than England and Wales combined, and about a fifth of British Columbia's entire land area. Not all of it is forest. Some is grass, scrub and peat. Most of it is boreal and montane forest.

The headline finding is the slope. The first twenty years of the record, 2000 through 2019, produced 9.25 million hectares — 45% of the total. The six years since produced 11.09 million, or 55%. On the corrected basis the tilt is steeper than the version this article originally described, not shallower. There is no reading of the line where this is a stable system with normal year-to-year variation.

What the data actually says

The record seasons, using each province's official totals:

Two things stand out. First, the records keep replacing each other: BC set its all-time record in 2017, broke it in 2018, then nearly doubled it in 2023. Second, the bad years have stopped being rare. Between 2000 and 2016 a million-hectare season had never happened in either province. Since 2017 there have been five.

Forest carbon

Canada's boreal forest is one of the largest terrestrial carbon stores on Earth, and a meaningful share of it stands in the BC and Alberta forest belt the animation plots. When it burns, the carbon leaves.

The 2023 season put that on the record at national scale. A study published in Nature (Byrne et al., 2024) estimated Canada's 2023 fires released 647 megatonnes of carbon between May and September, a figure NASA's independent satellite estimate matches. Converted to carbon dioxide, that is roughly two and a half billion tonnes, several times Canada's annual fossil-fuel emissions, in one fire season. The study's authors note it is comparable to the yearly fossil emissions of a large industrialised country.

None of it appears in Canada's official greenhouse-gas inventory. UNFCCC accounting rules treat wildfire as a natural disturbance rather than an anthropogenic emission. That choice is defensible for unmanaged forest, but it produces an awkward result: a country with a managed forest sector reports flat emissions while billions of tonnes of carbon physically combust on its territory, and the forest that was supposed to be the offsetting sink is the thing that is burning.

Forest regeneration

The traditional fire regime in western Canada ran on long cycles: a stand-replacing fire roughly once a century or more, then regeneration back to a similar forest within a lifetime. The acceleration is breaking that pattern in three ways.

Reburn intervals are collapsing. Parts of the BC interior that burned in 2003 burned again in 2017 and 2021. An interval that used to be measured in generations is now, in some watersheds, under twenty years.

The regenerating forest is more flammable than what it replaced. Young regrowth lacks the moisture buffer of a mature canopy, so it burns hotter and faster, killing the seed bank that the next regeneration cycle depends on.

And after the largest burns, some land is not coming back as forest at all. Where a fire footprint is big enough that no seed source survives nearby, the land regenerates to grass and shrub instead. The affected areas are small in national land-cover statistics so far, but they are concentrated exactly where the forest matters most, for fibre supply, for caribou and salmon habitat, and for Indigenous food systems.

Downstream water

Western Canada's drinking water and irrigation run on snowmelt, and the snowpack sits on forested headwaters. The forest shades the snow so it melts slowly, and its roots hold the soil so meltwater arrives as a stream rather than a pulse.

Post-fire hydrology studies find the same pattern after a watershed burns: the melt comes earlier, the peak flows come sharper and harder on downstream bridges, culverts and water intakes, and sediment loads multiply, contaminating municipal intakes and silting reservoirs. BC's Thompson region shows what this looks like when it compounds. Watersheds there burned in 2017, then burned again in 2021, and communities like Lytton have been managing post-fire water quality ever since the fires took the forest above them.

Communities

The displacement record runs alongside the fire record. The 2017 BC season forced tens of thousands from their homes in the interior. In 2021 the village of Lytton burned to the ground the day after setting Canada's all-time temperature record. The 2023 season displaced about 232,000 people across Canada, the largest evacuation total in the modern record. In 2024 the Jasper fire destroyed 358 buildings, roughly a third of the townsite.

The burden is not evenly spread. Indigenous Services Canada counted nearly 25,000 First Nations evacuees by mid-July of the 2023 season, with more than 95 Indigenous communities evacuated before it ended. The longer record is worse: from 1980 to 2021, Indigenous communities accounted for 42 per cent of wildfire evacuations in Canada, against roughly 5 per cent of the population. The reasons are structural. About 80 per cent of Indigenous communities sit in the forested regions where the fires are, often with less suppression infrastructure than nearby municipalities.

The insurance market

The insured-loss record tells the same acceleration story in dollars. Fort McMurray in 2016 cost insurers 3.7 billion dollars, the most expensive disaster in Canadian history at the time. The 2023 Okanagan and Shuswap fires cost 720 million, the costliest insured event in BC's history. Jasper in 2024 has reached 1.2 to 1.3 billion as claims settled, the second-costliest fire event in Canadian history. Three of the country's worst insurance events, in eight years, all wildfire.

Insurers have responded the way insurers do: repricing wildland-urban interface risk, and in the highest-risk interior communities, writing new policies reluctantly or not at all. Where private coverage retreats, the cost defaults to governments through disaster financial assistance programs, which are paid from general revenue and priced politically rather than actuarially. That gap between actuarial risk and political pricing is where the acceleration lands on the public balance sheet.

The criticisms worth taking seriously

The database flatters the past. Partly true. Perimeter mapping is better now than in 2000, so some of the apparent acceleration is better detection of fires that would once have been missed. But the bias in the recent data runs the other way, and it is bigger: the NFDB perimeter file lags official provincial totals by a season or two, and the June 2025 release this animation uses is still missing burn area from 2023 and 2024, most of it in Alberta. The corrected slope is steeper than the one on screen, not shallower.

Perimeters overstate burning. True, and worth knowing. A fire perimeter includes unburned islands inside the boundary, so perimeter area runs higher than actual burned area. This affects the level, not the trend, and it is why this article quotes each province's official totals alongside the perimeter record rather than treating the map as a precise ledger.

It is just climate change, and the framing is alarmist. The attribution research says the first half plainly: one published estimate found the record 2017 BC season burned roughly eleven times more land than it would have without human-caused climate change. But climate is not the only driver. A century of aggressive fire suppression left unusually heavy fuel loads in second-growth forest, and fuel is a lever that can be pulled regardless of emissions outcomes. Prescribed burning works whether or not the climate cooperates.

BC and Alberta are not all of Canada. Correct. Quebec's 2023 season was historic and is not on this map, and 2024 still burned 5.3 million hectares nationally. Adding the rest of the country raises the totals; it does not change the direction. The all-Canada version of this animation is on our backlog.

What it adds up to

For most of the 2000s a million-hectare season in BC or Alberta was unprecedented. There have now been five since 2017, including one that burned five million hectares across the two provinces. Carbon accounting, forest management, watershed planning and insurance pricing were all built on the old baseline, and none of them has fully adjusted to the new one.

The practitioners' to-do list is not controversial: restore prescribed burning, in particular with the First Nations whose fire management was suppressed for most of the twentieth century; price wildfire risk on actuarial rather than political timelines; plan watersheds on the assumption that some of their forest cover will burn this decade; and report wildfire carbon in the national inventory even where UNFCCC rules do not demand it. The animation does not make any of those arguments by itself. It establishes the fact the arguments depend on: the pattern is real, and it is accelerating.