Drossel-Schwabl model: trees grow slowly, fires spread fast — the system self-tunes to criticality with power-law avalanches
Rules: Empty→Tree (prob p); Tree→Fire if neighbor burning; Tree→Fire (prob f, lightning)
SOC condition: f/p → 0, L → ∞ simultaneously (Drossel-Schwabl 1992)
Avalanche dist: P(s) ~ s^{-τ}, τ ≈ 1.0–1.3 (dimension-dependent)
No tuning needed: unlike Ising at Tc, system finds critical point automatically