diff --git a/packages/engine-ts/src/ClimatePhysics.generated.ts b/packages/engine-ts/src/ClimatePhysics.generated.ts
index c89011bd..fa1126d3 100644
--- a/packages/engine-ts/src/ClimatePhysics.generated.ts
+++ b/packages/engine-ts/src/ClimatePhysics.generated.ts
@@ -60,6 +60,7 @@ export function idealTerrain(
   const temp = tile.temperature
   const moist = tile.moisture
   const elev = tile.elevation
+  const canopy = tile.canopy_cover ?? 0
 
   const transitions = (spec['terrain_transitions'] ?? {}) as Record<string, Array<Record<string, unknown>>>
   const rules: Array<Record<string, unknown>> = transitions[tid] ?? []
@@ -67,7 +68,7 @@ export function idealTerrain(
 
   for (const rule of rules) {
     const cond = rule['condition'] as string ?? ''
-    if (evalCondition(cond, temp, moist, elev)) {
+    if (evalCondition(cond, temp, moist, elev, canopy)) {
       const becomes = rule['becomes'] as string ?? ''
       if (becomes === 'classify') return classifyTerrain(temp, moist, elev)
       return becomes
@@ -88,17 +89,17 @@ export function leyChannelingMult(
   return leySpec['on_ley_generic'] ?? 2.0
 }
 
-export function evalCondition(cond: string, temp: number, moist: number, elev: number): boolean {
+export function evalCondition(cond: string, temp: number, moist: number, elev: number, canopy = 0): boolean {
   if (cond.includes(' OR ')) {
-    return cond.split(' OR ').some(part => evalCondition(part.trim(), temp, moist, elev))
+    return cond.split(' OR ').some(part => evalCondition(part.trim(), temp, moist, elev, canopy))
   }
   if (cond.includes(' AND ')) {
-    return cond.split(' AND ').every(part => evalCondition(part.trim(), temp, moist, elev))
+    return cond.split(' AND ').every(part => evalCondition(part.trim(), temp, moist, elev, canopy))
   }
   let clean = cond.trim()
   if (clean.startsWith('(') && clean.endsWith(')')) clean = clean.slice(1, -1)
   const tokens = clean.trim().split(' ')
-  if (tokens.length < 3) { console.warn(`ClimateSpecEval: bad condition: '${cond}'`); return false }
+  if (tokens.length < 3) return false
   const [field, op, valStr] = tokens
   const value = parseFloat(valStr)
   let actual: number
@@ -106,7 +107,8 @@ export function evalCondition(cond: string, temp: number, moist: number, elev: n
     case 'temperature': actual = temp; break
     case 'moisture':    actual = moist; break
     case 'elevation':   actual = elev; break
-    default: console.warn(`ClimateSpecEval: unknown field '${field}'`); return false
+    case 'canopy':      actual = canopy; break
+    default: return false
   }
   switch (op) {
     case '<':  return actual < value
@@ -265,7 +267,7 @@ export class ClimatePhysics {
 
     let any_aerosol = false
     for (let i = 0; i < tiles.length; i++) {
-      if (((tiles[i] as any).sulfate_aerosol ?? 0) > 0.001) { any_aerosol = true; break }
+      if (((tiles[i] as any).sulfate_aerosol ?? 0) > 0.1) { any_aerosol = true; break }
     }
     if (!any_aerosol) return
     const cooling_rate = aerosol_cfg['cooling_rate'] ?? 0.06
diff --git a/packages/engine-ts/src/EcologyPhysics.generated.ts b/packages/engine-ts/src/EcologyPhysics.generated.ts
index 0bc803f2..f70f9164 100644
--- a/packages/engine-ts/src/EcologyPhysics.generated.ts
+++ b/packages/engine-ts/src/EcologyPhysics.generated.ts
@@ -56,7 +56,7 @@ function getBiome(biomeId: string): BiomeDef | null {
 // ---------------------------------------------------------------------------
 
 function _getSubstrate(tile: TileState): string {
-  if (true) {
+  if (tile.substrate_id !== "") {
     return tile.substrate_id
   }
   return ""
@@ -262,7 +262,7 @@ function classifyBiome(tile: TileState): string {
 // ---------------------------------------------------------------------------
 
 function _isWater(tile: TileState): boolean {
-  if (true) {
+  if (tile.substrate_id !== "") {
     let sub = tile.substrate_id
     return ["deep_water", "shallow_water", "lake_bed"].includes(sub)
   }
diff --git a/packages/engine-ts/src/MapGenerator.generated.ts b/packages/engine-ts/src/MapGenerator.generated.ts
index 17b2aba9..2acecfeb 100644
--- a/packages/engine-ts/src/MapGenerator.generated.ts
+++ b/packages/engine-ts/src/MapGenerator.generated.ts
@@ -249,7 +249,7 @@ class GenMap {
           wind_direction: gt?.wind_direction ?? 0,
           wind_speed: gt?.wind_speed ?? 0.5,
           quality: gt?.quality ?? 2,
-          quality_progress: gt?.quality_progress ?? 0,
+          quality_progress: gt?.quality_progress ?? (((col * 7 + row * 13) % 11) - 5),  // stagger -5..+5 to prevent synchronized biome flips
           river_edges: gt?.river_edges ?? [],
           flow_accumulation: gt?.flow_accumulation ?? 0.0,
           original_biome_id: '',
@@ -272,6 +272,7 @@ class GenMap {
           pressure: 1013.0,
           pressure_anomaly: 0.0,
           humidity: 0.0,
+          sulfate_aerosol: 0.0,
           // Ecology fields (populated by EcologyPhysics)
           canopy_cover: 0.0,
           undergrowth: 0.0,
diff --git a/packages/engine-ts/src/runner.ts b/packages/engine-ts/src/runner.ts
index c36c215a..eac4f2ac 100644
--- a/packages/engine-ts/src/runner.ts
+++ b/packages/engine-ts/src/runner.ts
@@ -81,50 +81,6 @@ function encodeTerrainId(terrainId: string): number {
   return i / (TERRAIN_ORDER.length - 1)
 }
 
-// ---------------------------------------------------------------------------
-// Terrain cache
-// ---------------------------------------------------------------------------
-
-export function buildTerrainCache(): Map<string, TerrainData> {
-  const terrainMods = import.meta.glob(
-    '@data/terrain/*.json',
-    { eager: true, import: 'default' },
-  ) as Record<string, { terrains: TerrainData[] }>
-
-  const cache = new Map<string, TerrainData>()
-  for (const mod of Object.values(terrainMods)) {
-    if (!mod?.terrains) continue
-    for (const terrain of mod.terrains) {
-      cache.set(terrain.id, terrain)
-    }
-  }
-  return cache
-}
-
-// ---------------------------------------------------------------------------
-// Params loading
-// ---------------------------------------------------------------------------
-
-type ClimateParamsRaw = Record<string, number | Record<string, unknown>>
-
-function flattenParams(raw: ClimateParamsRaw): Record<string, number> {
-  const out: Record<string, number> = {}
-  for (const [k, v] of Object.entries(raw)) {
-    if (typeof v === 'number') out[k] = v
-  }
-  return out
-}
-
-export function loadClimateParams(): Record<string, number> {
-  const mods = import.meta.glob(
-    '@data/climate_params.json',
-    { eager: true, import: 'default' },
-  ) as Record<string, ClimateParamsRaw>
-  const raw = Object.values(mods)[0]
-  if (!raw) throw new Error('climate_params.json not found via @data/ alias')
-  return flattenParams(raw)
-}
-
 // ---------------------------------------------------------------------------
 // Snapshot encoding
 // ---------------------------------------------------------------------------
@@ -133,7 +89,6 @@ export function encodeSnapshot(
   grid: GridState,
   turn: number,
   events: EcologicalEvent[] = [],
-  terrainCache?: Map<string, TerrainData>,
   prevStats?: TurnStats,
 ): GridSnapshot {
   const n = grid.tiles.length
@@ -163,7 +118,7 @@ export function encodeSnapshot(
     texC[base + 3] = tile.habitat_suitability ?? 0.0
   }
 
-  const stats = computeTurnStats(grid, terrainCache, prevStats)
+  const stats = computeTurnStats(grid, prevStats)
 
   return {
     texA, texB, texC,
@@ -183,7 +138,6 @@ const EMPTY_SCHOOL_RECORD: Record<LeySchool, number> = { death: 0, life: 0, natu
 
 export function computeTurnStats(
   grid: GridState,
-  terrainCache?: Map<string, TerrainData>,
   prevStats?: TurnStats,
 ): TurnStats {
   const { tiles, width, height } = grid
@@ -224,7 +178,7 @@ export function computeTurnStats(
     albedoSum += albedo
     solarSum += solar * (1.0 - albedo)
 
-    aerosolSum += (tile as Record<string, number>).sulfate_aerosol ?? 0
+    aerosolSum += tile.sulfate_aerosol ?? 0
     windSpeedSum += tile.wind_speed ?? 0
 
     if (isWater) {
@@ -297,6 +251,7 @@ export function cloneGridState(grid: GridState): GridState {
     global_avg_temp: grid.global_avg_temp,
     ocean_dead_fraction: grid.ocean_dead_fraction,
     ecosystem_health: grid.ecosystem_health,
+    sea_level: grid.sea_level,
     tiles: grid.tiles.map((t) => ({
       ...t,
       river_edges: [...t.river_edges],
@@ -371,7 +326,7 @@ export function runScenarioSync(
     const events = physics.processStep(grid, turn, worldSeed)
     ecology.processStep(grid)
     const prev = snapshots.length > 0 ? snapshots[snapshots.length - 1].stats : undefined
-    snapshots.push(encodeSnapshot(grid, scenarioTurn, events, terrainCache, prev))
+    snapshots.push(encodeSnapshot(grid, scenarioTurn, events, prev))
   }
 
   return {
@@ -409,7 +364,7 @@ export function extendSimulation(
     const events = physics.processStep(grid, turn, worldSeed)
     ecology.processStep(grid)
     const prev = snapshots.length > 0 ? snapshots[snapshots.length - 1].stats : undefined
-    snapshots.push(encodeSnapshot(grid, scenarioTurn, events, terrainCache, prev))
+    snapshots.push(encodeSnapshot(grid, scenarioTurn, events, prev))
   }
 
   return {
diff --git a/packages/engine-ts/src/types.ts b/packages/engine-ts/src/types.ts
index 0f766fc7..e0ba7592 100644
--- a/packages/engine-ts/src/types.ts
+++ b/packages/engine-ts/src/types.ts
@@ -13,6 +13,7 @@ export interface TileState {
   pressure: number          // atmospheric pressure (hPa, ~995-1030)
   pressure_anomaly: number  // dynamic anomaly offset from baseline
   humidity: number          // atmospheric humidity [0, 1]
+  sulfate_aerosol: number   // stratospheric aerosol opacity [0, 1] from volcanic/impact events
   quality: number           // 1-5 (Q1 prolific .. Q5 epic)
   quality_progress: number  // counter toward next quality change
   river_edges: number[]     // edge indices [0-5] where rivers flow
@@ -167,7 +168,7 @@ export interface SimulationResult {
   continuation: ContinuationState
 }
 
-// Terrain data shape from games/age-of-four/data/terrain/*.json
+// Terrain data shape from games/age-of-dwarves/data/terrain/*.json
 export interface TerrainData {
   id: string
   name: string
diff --git a/packages/engine-ts/src/worker-protocol.ts b/packages/engine-ts/src/worker-protocol.ts
index ede07adc..405645a4 100644
--- a/packages/engine-ts/src/worker-protocol.ts
+++ b/packages/engine-ts/src/worker-protocol.ts
@@ -15,6 +15,7 @@ export interface InitCommand {
   type: 'init'
   terrainData: Record<string, TerrainData>
   params: Record<string, number>
+  spec?: Record<string, unknown>
 }
 
 export interface RunCommand {