Fire in a national park is often reported as damage. In many ecosystems it is a required process, and its long absence causes more harm than its presence does.
Many ecosystems are built around recurring fire
Grasslands, savannas and several forest types burned at regular intervals long before organised suppression, and their dominant species are adapted to that rhythm.
Some trees have thick insulating bark, some resprout from protected buds, and some cones only open and release seed when heated.
Fire also recycles nutrients locked in accumulated litter and opens the canopy, which allows light-dependent species to germinate in the gaps that follow.
Suppression changed the fuel, not the fire risk
Excluding fire for decades allows dead material and dense understorey growth to build up well beyond what these systems historically carried.
When ignition eventually occurs in that condition, the fire burns hotter and reaches the canopy, which is a different event from the frequent low-intensity fires the system evolved with.
High-intensity fire kills mature trees that would have survived a low burn, sterilises soil in patches and creates conditions favouring invasive species afterwards.
Prescribed burning restores the interval deliberately
Controlled burns are set under specified conditions of humidity, wind and fuel moisture, chosen so the fire stays at low intensity and within planned boundaries.
The aim is to reduce accumulated fuel and reset the vegetation, which lowers the severity of any unplanned fire that follows in the same area.
The window for safe burning is narrow, and it has narrowed further as hotter, drier conditions extend the period during which any ignition is too risky to attempt.
Some natural fires are allowed to run
Where a lightning fire starts in a remote area under manageable conditions, parks may monitor it rather than suppress it, allowing it to perform its ecological function.
This requires continuous assessment, defined thresholds for intervention and the ability to shift to suppression quickly if weather changes.
It is also the option most exposed to public criticism, because a fire left burning is visible and its rationale is not, particularly where smoke affects nearby communities.
Proximity to development constrains the whole approach
Parks bordered by housing and infrastructure have far less room to use fire, because the consequences of an escape fall outside the boundary.
Suppression therefore remains the default near park edges, while managed fire is concentrated in interior areas where the risk is contained.
The long-term consequence is that fuel loads keep building in exactly the zones where a severe fire would do the most damage to people as well as habitat.