diff --git a/package-lock.json b/package-lock.json
index d8bd10b..940fca5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,6 +6,7 @@
     "": {
       "dependencies": {
         "@observablehq/framework": "^1.10.1",
+        "d3": "^7.9.0",
         "d3-dsv": "^3.0.1",
         "d3-time-format": "^4.1.0"
       },
@@ -1165,6 +1166,46 @@
         "node": ">=18"
       }
     },
+    "node_modules/d3": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/d3/-/d3-7.9.0.tgz",
+      "integrity": "sha512-e1U46jVP+w7Iut8Jt8ri1YsPOvFpg46k+K8TpCb0P+zjCkjkPnV7WzfDJzMHy1LnA+wj5pLT1wjO901gLXeEhA==",
+      "dependencies": {
+        "d3-array": "3",
+        "d3-axis": "3",
+        "d3-brush": "3",
+        "d3-chord": "3",
+        "d3-color": "3",
+        "d3-contour": "4",
+        "d3-delaunay": "6",
+        "d3-dispatch": "3",
+        "d3-drag": "3",
+        "d3-dsv": "3",
+        "d3-ease": "3",
+        "d3-fetch": "3",
+        "d3-force": "3",
+        "d3-format": "3",
+        "d3-geo": "3",
+        "d3-hierarchy": "3",
+        "d3-interpolate": "3",
+        "d3-path": "3",
+        "d3-polygon": "3",
+        "d3-quadtree": "3",
+        "d3-random": "3",
+        "d3-scale": "4",
+        "d3-scale-chromatic": "3",
+        "d3-selection": "3",
+        "d3-shape": "3",
+        "d3-time": "3",
+        "d3-time-format": "4",
+        "d3-timer": "3",
+        "d3-transition": "3",
+        "d3-zoom": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-array": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/d3-array/-/d3-array-3.2.4.tgz",
@@ -1176,6 +1217,90 @@
         "node": ">=12"
       }
     },
+    "node_modules/d3-axis": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-axis/-/d3-axis-3.0.0.tgz",
+      "integrity": "sha512-IH5tgjV4jE/GhHkRV0HiVYPDtvfjHQlQfJHs0usq7M30XcSBvOotpmH1IgkcXsO/5gEQZD43B//fc7SRT5S+xw==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-brush": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-brush/-/d3-brush-3.0.0.tgz",
+      "integrity": "sha512-ALnjWlVYkXsVIGlOsuWH1+3udkYFI48Ljihfnh8FZPF2QS9o+PzGLBslO0PjzVoHLZ2KCVgAM8NVkXPJB2aNnQ==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-drag": "2 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-selection": "3",
+        "d3-transition": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-chord": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-chord/-/d3-chord-3.0.1.tgz",
+      "integrity": "sha512-VE5S6TNa+j8msksl7HwjxMHDM2yNK3XCkusIlpX5kwauBfXuyLAtNg9jCp/iHH61tgI4sb6R/EIMWCqEIdjT/g==",
+      "dependencies": {
+        "d3-path": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-color": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-color/-/d3-color-3.1.0.tgz",
+      "integrity": "sha512-zg/chbXyeBtMQ1LbD/WSoW2DpC3I0mpmPdW+ynRTj/x2DAWYrIY7qeZIHidozwV24m4iavr15lNwIwLxRmOxhA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-contour": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/d3-contour/-/d3-contour-4.0.2.tgz",
+      "integrity": "sha512-4EzFTRIikzs47RGmdxbeUvLWtGedDUNkTcmzoeyg4sP/dvCexO47AaQL7VKy/gul85TOxw+IBgA8US2xwbToNA==",
+      "dependencies": {
+        "d3-array": "^3.2.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-delaunay": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/d3-delaunay/-/d3-delaunay-6.0.4.tgz",
+      "integrity": "sha512-mdjtIZ1XLAM8bm/hx3WwjfHt6Sggek7qH043O8KEjDXN40xi3vx/6pYSVTwLjEgiXQTbvaouWKynLBiUZ6SK6A==",
+      "dependencies": {
+        "delaunator": "5"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-dispatch": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-dispatch/-/d3-dispatch-3.0.1.tgz",
+      "integrity": "sha512-rzUyPU/S7rwUflMyLc1ETDeBj0NRuHKKAcvukozwhshr6g6c5d8zh4c2gQjY2bZ0dXeGLWc1PF174P2tVvKhfg==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-drag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-drag/-/d3-drag-3.0.0.tgz",
+      "integrity": "sha512-pWbUJLdETVA8lQNJecMxoXfH6x+mO2UQo8rSmZ+QqxcbyA3hfeprFgIT//HW2nlHChWeIIMwS2Fq+gEARkhTkg==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-selection": "3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-dsv": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/d3-dsv/-/d3-dsv-3.0.1.tgz",
@@ -1200,6 +1325,57 @@
         "node": ">=12"
       }
     },
+    "node_modules/d3-ease": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-ease/-/d3-ease-3.0.1.tgz",
+      "integrity": "sha512-wR/XK3D3XcLIZwpbvQwQ5fK+8Ykds1ip7A2Txe0yxncXSdq1L9skcG7blcedkOX+ZcgxGAmLX1FrRGbADwzi0w==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-fetch": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-fetch/-/d3-fetch-3.0.1.tgz",
+      "integrity": "sha512-kpkQIM20n3oLVBKGg6oHrUchHM3xODkTzjMoj7aWQFq5QEM+R6E4WkzT5+tojDY7yjez8KgCBRoj4aEr99Fdqw==",
+      "dependencies": {
+        "d3-dsv": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-force": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-force/-/d3-force-3.0.0.tgz",
+      "integrity": "sha512-zxV/SsA+U4yte8051P4ECydjD/S+qeYtnaIyAs9tgHCqfguma/aAQDjo85A9Z6EKhBirHRJHXIgJUlffT4wdLg==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-quadtree": "1 - 3",
+        "d3-timer": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-format": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-format/-/d3-format-3.1.0.tgz",
+      "integrity": "sha512-YyUI6AEuY/Wpt8KWLgZHsIU86atmikuoOmCfommt0LYHiQSPjvX2AcFc38PX0CBpr2RCyZhjex+NS/LPOv6YqA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-geo": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/d3-geo/-/d3-geo-3.1.1.tgz",
+      "integrity": "sha512-637ln3gXKXOwhalDzinUgY83KzNWZRKbYubaG+fGVuc/dxO64RRljtCTnf5ecMyE1RIdtqpkVcq0IbtU2S8j2Q==",
+      "dependencies": {
+        "d3-array": "2.5.0 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-hierarchy": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/d3-hierarchy/-/d3-hierarchy-3.1.2.tgz",
@@ -1208,11 +1384,100 @@
         "node": ">=12"
       }
     },
+    "node_modules/d3-interpolate": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-interpolate/-/d3-interpolate-3.0.1.tgz",
+      "integrity": "sha512-3bYs1rOD33uo8aqJfKP3JWPAibgw8Zm2+L9vBKEHJ2Rg+viTR7o5Mmv5mZcieN+FRYaAOWX5SJATX6k1PWz72g==",
+      "dependencies": {
+        "d3-color": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-path": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-path/-/d3-path-3.1.0.tgz",
+      "integrity": "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-polygon": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-polygon/-/d3-polygon-3.0.1.tgz",
+      "integrity": "sha512-3vbA7vXYwfe1SYhED++fPUQlWSYTTGmFmQiany/gdbiWgU/iEyQzyymwL9SkJjFFuCS4902BSzewVGsHHmHtXg==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-quadtree": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-quadtree/-/d3-quadtree-3.0.1.tgz",
+      "integrity": "sha512-04xDrxQTDTCFwP5H6hRhsRcb9xxv2RzkcsygFzmkSIOJy3PeRJP7sNk3VRIbKXcog561P9oU0/rVH6vDROAgUw==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-random": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-random/-/d3-random-3.0.1.tgz",
+      "integrity": "sha512-FXMe9GfxTxqd5D6jFsQ+DJ8BJS4E/fT5mqqdjovykEB2oFbTMDVdg1MGFxfQW+FBOGoB++k8swBrgwSHT1cUXQ==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-require": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/d3-require/-/d3-require-1.3.0.tgz",
       "integrity": "sha512-XaNc2azaAwXhGjmCMtxlD+AowpMfLimVsAoTMpqrvb8CWoA4QqyV12mc4Ue6KSoDvfuS831tsumfhDYxGd4FGA=="
     },
+    "node_modules/d3-scale": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/d3-scale/-/d3-scale-4.0.2.tgz",
+      "integrity": "sha512-GZW464g1SH7ag3Y7hXjf8RoUuAFIqklOAq3MRl4OaWabTFJY9PN/E1YklhXLh+OQ3fM9yS2nOkCoS+WLZ6kvxQ==",
+      "dependencies": {
+        "d3-array": "2.10.0 - 3",
+        "d3-format": "1 - 3",
+        "d3-interpolate": "1.2.0 - 3",
+        "d3-time": "2.1.1 - 3",
+        "d3-time-format": "2 - 4"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-scale-chromatic": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-3.1.0.tgz",
+      "integrity": "sha512-A3s5PWiZ9YCXFye1o246KoscMWqf8BsD9eRiJ3He7C9OBaxKhAd5TFCdEx/7VbKtxxTsu//1mMJFrEt572cEyQ==",
+      "dependencies": {
+        "d3-color": "1 - 3",
+        "d3-interpolate": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-selection": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-selection/-/d3-selection-3.0.0.tgz",
+      "integrity": "sha512-fmTRWbNMmsmWq6xJV8D19U/gw/bwrHfNXxrIN+HfZgnzqTHp9jOmKMhsTUjXOJnZOdZY9Q28y4yebKzqDKlxlQ==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-shape": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-3.2.0.tgz",
+      "integrity": "sha512-SaLBuwGm3MOViRq2ABk3eLoxwZELpH6zhl3FbAoJ7Vm1gofKx6El1Ib5z23NUEhF9AsGl7y+dzLe5Cw2AArGTA==",
+      "dependencies": {
+        "d3-path": "^3.1.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/d3-time": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/d3-time/-/d3-time-3.1.0.tgz",
@@ -1235,6 +1500,47 @@
         "node": ">=12"
       }
     },
+    "node_modules/d3-timer": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-3.0.1.tgz",
+      "integrity": "sha512-ndfJ/JxxMd3nw31uyKoY2naivF+r29V+Lc0svZxe1JvvIRmi8hUsrMvdOwgS1o6uBHmiz91geQ0ylPP0aj1VUA==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/d3-transition": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/d3-transition/-/d3-transition-3.0.1.tgz",
+      "integrity": "sha512-ApKvfjsSR6tg06xrL434C0WydLr7JewBB3V+/39RMHsaXTOG0zmt/OAXeng5M5LBm0ojmxJrpomQVZ1aPvBL4w==",
+      "dependencies": {
+        "d3-color": "1 - 3",
+        "d3-dispatch": "1 - 3",
+        "d3-ease": "1 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-timer": "1 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "peerDependencies": {
+        "d3-selection": "2 - 3"
+      }
+    },
+    "node_modules/d3-zoom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-zoom/-/d3-zoom-3.0.0.tgz",
+      "integrity": "sha512-b8AmV3kfQaqWAuacbPuNbL6vahnOJflOhexLzMMNLga62+/nh0JzvJ0aO/5a5MVgUFGS7Hu1P9P03o3fJkDCyw==",
+      "dependencies": {
+        "d3-dispatch": "1 - 3",
+        "d3-drag": "2 - 3",
+        "d3-interpolate": "1 - 3",
+        "d3-selection": "2 - 3",
+        "d3-transition": "2 - 3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/data-urls": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-5.0.0.tgz",
@@ -1313,6 +1619,14 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/delaunator": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/delaunator/-/delaunator-5.0.1.tgz",
+      "integrity": "sha512-8nvh+XBe96aCESrGOqMp/84b13H9cdKbG5P2ejQCh4d4sK9RL4371qou9drQjMhvnPmhWl5hnmqbEE0fXr9Xnw==",
+      "dependencies": {
+        "robust-predicates": "^3.0.2"
+      }
+    },
     "node_modules/delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
@@ -2338,6 +2652,11 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.2.tgz",
+      "integrity": "sha512-IXgzBWvWQwE6PrDI05OvmXUIruQTcoMDzRsOd5CDvHCVLcLHMTSYvOK5Cm46kWqlV3yAbuSpBZdJ5oP5OUoStg=="
+    },
     "node_modules/rollup": {
       "version": "4.21.1",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.21.1.tgz",
diff --git a/package.json b/package.json
index 3697183..a7feeb1 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@observablehq/framework": "^1.10.1",
+    "d3": "^7.9.0",
     "d3-dsv": "^3.0.1",
     "d3-time-format": "^4.1.0"
   },
diff --git a/src/data/litellmcost.json.js b/src/data/litellmcost.json.js
new file mode 100644
index 0000000..3b83dcc
--- /dev/null
+++ b/src/data/litellmcost.json.js
@@ -0,0 +1,14 @@
+import * as d3 from "d3";
+
+const jsonURL = 'https://raw.githubusercontent.com/BerriAI/litellm/refs/heads/main/model_prices_and_context_window.json';
+
+const litellm = await d3.json(jsonURL);
+
+const litellmdata = Object.keys(litellm).map( key => {
+  return {
+    id: key,
+    ...litellm[key]
+  };
+}).slice(1); // slice to remove the first entry, which is a sample/example.
+
+process.stdout.write(JSON.stringify(litellmdata));
\ No newline at end of file
diff --git a/src/llm-scenario-calc.md b/src/llm-scenario-calc.md
index 76bb844..f996360 100644
--- a/src/llm-scenario-calc.md
+++ b/src/llm-scenario-calc.md
@@ -4,18 +4,13 @@ title: LLM service cost scenarios
 # LLM service cost scenarios
 
 ```js
-const jsonURL = 'https://raw.githubusercontent.com/BerriAI/litellm/refs/heads/main/model_prices_and_context_window.json'
-const litellm =  d3.json(jsonURL)
+const litellmcost = FileAttachment("data/litellmcost.json").json();
 ```
-
 ```js
-const example = Object.keys(litellm).map( key => {
-  return {
-    id: key,
-    ...litellm[key]
-  };
-}).slice(1); // slice to remove the first entry, which is a sample/example.
+const example = litellmcost
+```
 
+```js
 let USDollar = new Intl.NumberFormat('en-US', {
     style: 'currency',
     currency: 'USD',
@@ -25,7 +20,8 @@ function calc_litellm_cost(provider) {
   var costs = u.users * ((u.calls*u.avgI *provider.input_cost_per_token) + (u.calls*u.avgO *provider.output_cost_per_token))
   return costs
 } 
-
+```
+```js
 const allcostdata = example.map(d => {
   return {
   model: d.id,
@@ -57,7 +53,7 @@ const scenarioOptions = view(Inputs.bind(Inputs.button([
 ```
 
 ```js
-const modelSelection = view(Inputs.select(example, {label: "Select a model", format: x => x.id + ' (' + x.litellm_provider + ')'}))
+const modelSelection = view(Inputs.select(example, {label: "Select a model", format: x => x.id + ' (' + x.litellm_provider + ')', value: this?.value ?? 0}))
 ```
 
 Based on crowdsourced cost data from [LiteLLM](https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json) for **${modelSelection.id}** (${modelSelection.litellm_provider})  
@@ -93,4 +89,23 @@ const chart = Plot.plot({
   ]
 })
 display(chart)
-```
\ No newline at end of file
+```
+
+<details>
+  <summary>carbon</summary>
+
+Enter your assumed rate of energy consumption (kWh per million tokens) and grid emission factor (grams of CO₂ equivalent per kWh) to produce a back-of-the-envelope estimate of carbon emissions from model inference.
+
+- Daily ${d3.format(",.2f")((u.users*u.calls)*(u.avgI+u.avgO)/1e6*energy*co2/1e3)} kgCO₂e
+- Annual ${d3.format(",.2f")((u.users*u.calls)*(u.avgI+u.avgO)/1e6*energy*co2/1e3*365)} kgCO₂e  
+
+${d3.format(",.0f")((u.users*u.calls)*(u.avgI+u.avgO)/1e6*365)} million tokens and ${d3.format(",.0f")((u.users*u.calls)*(u.avgI+u.avgO)/1e6*energy*365)} kWh per year 
+
+```js
+const energy = view(Inputs.range([0.01,30],{value: 1.11, transform: Math.sqrt, step: 0.01, label: "kWh/Mtok"}));
+const co2 = view(Inputs.range([0,970],{value: 375, transform: Math.sqrt, step: 1, label: "gCO₂e/kWh"}))
+
+
+```
+
+</details>
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