TerraKeepKeeping Earth within its limits
Cloud-free satellite view around Kazumba, Kasaï-Central (Democratic Republic of the Congo), with the finding area outlined
6.40°S 21.95°ENASA Blue Marble via GIBS · outline = finding area
Published

641 ha of forest loss flagged in Kazumba, DR Congo, over 90 days — at the regional pace

Kazumba, Kasaï-Central (Democratic Republic of the Congo) · seen · published

Between 2 July and 30 September 2026, satellite alert systems recorded 52,415 high-confidence deforestation alerts across Kazumba, Kasaï-Central, covering 641.47 hectares. An independent optical check using Sentinel-2 imagery supports it: median greenness (NDVI) fell by -0.123 between May and September, with 99% and 100% of pixels usable, so cloud is not hiding the picture. The area carries protected-or-indigenous tags.

What this is not: it is not proof of illegal clearing. The alerts cannot tell apart legal clearing, fire, storm damage, selective logging or plantation harvest, and regrowth cycles can look like loss. The loss rate here is 0.957× the surrounding 25 km neighbourhood — slightly below the regional pace, not an outlier. An El Niño phase (ONI 1.8) can dry vegetation and push NDVI down on its own.

What would change our mind: concession and protected-area layers showing authorised activity; burn-scar or fire data matching the alert footprint; or follow-up imagery showing green returning, which would point to seasonal stress or regrowth rather than permanent clearing.

Written by AI, then checked by a separate reviewer before publication. Every claim points at the evidence below.

What we saw

  • Area: 1,461 hectares — about 2,000 football fields
  • Nature’s work at stake: about $9.8M a year (a rough estimate of what this land does for people — clean water, carbon, food).
  • Global Forest Watch alerts — 52415 alerts (≥ high confidence), 641.47 ha, 2026-07-02…2026-09-30. (Sep 30, 2026) See the source ↗
  • Global Forest Watch alerts — 119338 alerts (≥ high confidence), 1460.72 ha, 2026-07-03…2026-10-01. (Oct 1, 2026) See the source ↗
  • Sentinel-2 satellite images — Median-composite NDVI changed -0.123 (2026-05-18 → 2026-09-30); valid pixels 99% / 100%. Scenes: [object Object], [object Object], [object Object], [object Object], [object Object], [object Object] (Sep 30, 2026)

What it might not be

  • Alerts lag reality by 1–2 weeks; recent clearing may be undercounted.
  • Cause is unattributed — fire, storm, legal logging and harvest cycles look alike.
  • Alert density is 0.957× the 25 km ring, i.e. slightly below the regional norm.
  • El Niño (ONI 1.8) can depress NDVI independently of clearing.
  • Monetary 'living value' figures are order-of-magnitude benefit transfers, not prices, and are not cited as findings.
  • Coverage is 30°N–30°S only — zero alerts outside the tropics means 'not monitored', not 'no loss'.
  • Cannot distinguish legal clearing, fire, storm damage and selective logging from illegal clearing; attribution needs concession/protected-area layers (M3).
  • Alerts lag reality by ~1–2 weeks; a burst just before the sweep is undercounted.
  • Regrowth and plantation harvest cycles look like loss; the baseline ring only partly compensates.
  • Persistent cloud can delay optical confirmation for months (SAR-only RADD alerts stay 'candidate').

What would change our mind

Newer satellite images that show no change, a correction from the data source, or a reply with evidence from the ground. If that happens, the case is marked “Turned out wrong” — in public — and it stays on this site.

Why this was published

Two separate sources agreed — Global Forest Watch alerts, then Sentinel-2 satellite images — and a reviewer checked the evidence before it went up.

Replies

Know this place? Say what you see. Replies are checked before they appear. No account, no email.

Replies are open on the interactive site (it needs JavaScript).

Ledger id 01a0f0e8-cc72-747e-b91d-e7658b36555d

Technical details rule, evidence ids, history, proof
Rule
forest_loss v1.0
Tier
T1
Tags
forest-hotspot, discovered, cod, democratic-republic-of-the-congo, kasai-central, kazumba, protected-or-indigenous
Confirmed
Yes — independent sensor signal, 2026-10-01
Rule FP rate
38 % · 6 of 16 decided
Location
6.40°S 21.95°E
Observed
2026-09-30
Opened
2026-09-30 by automatic rule forest_loss v1.0
  1. candidate
  2. confirmed
  3. published
  4. resolved

Evidence3

alertgfw-integrated-alerts

52415 alerts (≥ high confidence), 641.47 ha, 2026-07-02…2026-09-30.

alerts 52415ha 641.47high_alerts 52187high_ha 638.68highest_alerts 228highest_ha 2.79living_value_100y_npv2_usd 185727821living_value_100y_usd 430939500living_value_usd_yr 4309395
· forest_alerts v1.0 · gfw-integrated-cod-7-5-2026-07-02..2026-09-30
Source ↗
alertgfw-integrated-alerts

119338 alerts (≥ high confidence), 1460.72 ha, 2026-07-03…2026-10-01.

alerts 119338ha 1460.72high_alerts 118993high_ha 1456.5highest_alerts 345highest_ha 4.22living_value_100y_npv2_usd 422929167living_value_100y_usd 981311700living_value_usd_yr 9813117
· forest_alerts v1.0 · gfw-integrated-cod-7-5-2026-07-03..2026-10-01
Source ↗
scenesentinel-2-l2aConfirming signal

Median-composite NDVI changed -0.123 (2026-05-18 → 2026-09-30); valid pixels 99% / 100%. Scenes: [object Object], [object Object], [object Object], [object Object], [object Object], [object Object]

deltaNdvi -0.12293023357901012validPctA 99validPctB 100
· eo_compare v1.0 · s2-ndvi-median-cod-7-5-2026-05-18..2026-09-30

Context

0.96×
AOI vs its 25 km neighbourhood
AOI
420.36
Ring
439.134
Metric
alert ha per deg²
ENSO El Niño · ONI +1.8
  • Living value (benefit transfer, order of magnitude): 641.47 ha of tropical forest ≈ $4,309,395/yr alive (band $1,265,620–$16,695,540, 2020 USD), ≈ $430,939,500 over 100 yr ($185,727,821 NPV @ 2 %). Source: Costanza R. et al. et al. — a floor for one kind of value, not a price.

Publication gates

  • Evidence — 2 pieces from gfw-integrated-alerts — met
  • Independent confirmation — a different sensor (sentinel-2-l2a), 2026-10-01 — met
  • Human approval — 1 of 1 needed at tier 1 — met
  • Narration — AI-drafted by claude-opus-5 — met
Published
2026-10-01 by AI model
Narrated By
AI model
Reviewed By
AI model
Policy
2026-09-26-autonomous
Note
autonomous publish: narrated by model:claude-opus-5, reviewed by model:claude-sonnet-5 (policy 2026-09-26-autonomous)

History6

  1. evidence added → publishedautomatic rule forest_loss v1.0
  2. status changed → publishedAI model
  3. reviewed → confirmedAI model
  4. narrated → confirmedAI model
  5. confirmed → confirmedautomatic rule forest_loss v1.0
  6. created → candidateautomatic rule forest_loss v1.0

Verify

Checkpoint
earthdeck.dev/findings/v1 · 1104 entries
Signed root
2d46ab865c78…d5686a
This case
6 signed events
Leaf
#1094 of 1104 — this case’s latest event
Leaf hash
0b30baa977f8…e384fe
Proof
6-hash audit path
  1. 88513b39f9c383d5ab1ca11bc62acd39e32983cbf32e4e3ac7fc4a664b87a2fe
  2. 8db4379abb0db900a5d972c3ca73855d12c04d644b096c2edc453ed7408ebc2f
  3. 611d5a427539aa6b2cd822d216b801219676e5fc85bb957be344d57f76e1b409
  4. f70b81a02441d6121c5ad48f6f4c3ddb21c1430b914c3b4ed38e548c75286ee7
  5. faf94375e7054adbd22fa0ead48c4d4d3a748de7b2b9cd5efbc8cf21e012ab03
  6. 8c9c126ddde5463be4c66b848b31cefa5e2e8b034ab906e8158680a170325566
Last event
91a69ebbd2bc…7cc08f
Note
Checkpoint text
earthdeck.dev/findings/v1
1104
LUarhlx4E7iZHtDXE5BrFb7xMhoCK404KhBp2snVaGo=

— earthdeck TkCXv/sH/NTGvayZVEMmgP9cZnDpvpCaJ9kK+Cb/ptytbf1au9W9DoMBSvoBcBgV8vaL/MaVF3YesXBKf/3RqhoFSgA=

Re-derive every entry, signature and trust rule yourself:

npx -y earthdeck ledger verify --remote https://vitalearth.io