The closing lecture of the WEPS cycle turns from doctrine and architecture to money — and opens with a rule the lecture holds itself to throughout: every figure will be attributed precisely to its source, and to what it actually measures, not to what one might wish it measured. On a subject this easy to sensationalize, that discipline is the argument's real foundation.

The lecture starts by explaining a mechanism, not a villain. France's forest-prevention program, DFCI, saw its funding cut by €34 million in the 2025 budget — months before Ribaute. This isn't negligence; it's structural. An extinction expense is visible and immediate. A prevention expense produces a result that is, by construction, invisible: nobody holds a press conference for the fire that didn't happen. That asymmetry is why prevention lines are cut first, almost everywhere, regardless of their actual cost-benefit ratio.

It then corrects a figure that circulates constantly and shouldn't: the €5.2 billion often cited as the cost of wildfires in France is, in fact, France Assureurs' total for all climate-related insurance claims — hail alone accounts for 43% of it. Wildfires aren't even broken out as their own category, in part because they structurally fall outside France's natural-catastrophe insurance regime. In its place, the lecture uses only precisely sourced figures: roughly €80 million in insurance payouts for the 2022 Gironde fires alone, and the tourism economy — 7% of the department's GDP — directly exposed each time it happens again.

That sets up the lecture's central comparison. A WEPS deployment across an area the size of Ribaute costs an estimated €300,000 to €2.8 million, depending on configuration — more than two orders of magnitude below the €80 million in Gironde insurance payouts alone, and the same order of magnitude as the DFCI budget cut itself. This isn't a request for fundamentally new money. It's a case for redirecting a portion of a budget whose insufficiency has already been debated in public.

The lecture closes on reframing, not on a new figure: prevention treated not as a budget line to sacrifice first, but as infrastructure — something built once, maintained, and reducing the cost of the next catastrophe rather than waiting to pay for it. Ribaute, in 2025. The Landes and Gironde, in 2026. If nothing changes in how this expense is understood, there's no reason to expect 2027 to be different.