Summary
A BMJ letter argues that wildfire prevention should distinguish what starts a fire from the conditions that help it grow. It says climate change can lengthen fire seasons, dry fuels and increase extreme fire weather.
A letter published in The BMJ on 15 October 2026 argues that wildfire prevention should distinguish how fires start from the conditions that allow them to become large. Its author, Giovanni Ghirga, says treating these as separate causal questions helps avoid attributing changes in burned area to climate change alone.
Ghirga challenges a statement about Canada’s burned forest area doubling “mainly as a result of climate change,” arguing that it combines two levels of explanation. In the letter, he says climate change can lengthen fire seasons, dry fuels and increase extreme fire weather and large fires.
Two parts of wildfire risk
Ignition is the event that starts a fire. Fire weather describes conditions that can make fires more likely to spread or grow. The distinction is useful because explaining how a fire begins is not the same as explaining why it becomes extensive.
Ghirga’s argument is that prevention should ask both what ignites fires and what enables them to grow. That framing keeps attention on the separate roles of ignition and fire-conducive conditions, rather than treating burned area as the result of a single cause.
A causal framing, not a prevention trial
The BMJ item is a letter, not a study measuring wildfire causes or evaluating a prevention programme. It makes a case for separating the questions of ignition and fire weather; the supplied text does not assess particular prevention measures.