thibaudcolas · January 23, 2025 13:07 · Jan 23, 2025
diff --git a/carbon-ratings-swdm-v4-co2.js b/carbon-ratings-swdm-v4-co2.js
@@ -0,0 +1,34 @@
+import { co2 } from "@tgwf/co2";
+
+const swdmV4 = new co2({ model: "swd", version: 4 });
+
+// Figures as of 2025-01-23
+// https://sustainablewebdesign.org/digital-carbon-ratings/
+const ratings = {
+  "A+": 272.51,
+  A: 531.15,
+  B: 975.85,
+  C: 1410.39,
+  D: 1875.01,
+  E: 2419.56,
+  F: 2419.57,
+};
+
+/**
+ * Re-calculate the Digital Carbon Rating Scale thresholds for each percentile transfer size,
+ * to compare with official figures.
+ */
+Object.entries(ratings).forEach(([rating, ratingValue]) => {
+  const estimate = swdmV4.perVisitTrace(ratingValue * 1000, false, {
+    gridIntensity: {
+      device: 494,
+      dataCenter: 494,
+      networks: 494,
+    },
+    firstVisitPercentage: 1,
+    returnVisitPercentage: 0,
+    dataReloadRatio: 0,
+  });
+
+  console.log(`${rating}: ${estimate.co2}`);
+});
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