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| +<html lang="en"> |
| +<head> |
| +<meta charset="utf-8"> |
| +<meta name="viewport" content="width=device-width, initial-scale=1"> |
| +<title>Prompt & carbon ledger — Paul Campbell</title> |
| +<link rel="icon" href="/icon.png" type="image/png"> |
| +<link rel="icon" href="/icon.svg" type="image/svg+xml"> |
| +</head> |
| +<body> |
| + |
| +<h1>Prompt & carbon ledger</h1> |
| + |
| +<p>This site is built and maintained by <a href="https://claude.com/claude-code">Claude Code</a> |
| +(model: Claude Fable 5). Nothing here was written by hand except the prompts below. |
| +Each row records an instruction given to the agent, what came of it, and a rough |
| +estimate of the energy and carbon the AI work cost.</p> |
| + |
| +<table border="1" cellpadding="6"> |
| +<tr> |
| + <th>Date</th> |
| + <th>Prompt (verbatim)</th> |
| + <th>What happened</th> |
| + <th>Est. energy</th> |
| + <th>Est. CO₂e</th> |
| +</tr> |
| +<tr> |
| + <td>July 21, 2026</td> |
| + <td>“I want to replace paulca.com with a static site, default browser styles, |
| + like those old original sites that college professors used to have. It will just |
| + be a short bio, and link out to various profiles that I have. Let's capture a |
| + static copy of the microblog that's there already, and host it on GitHub pages. |
| + I think you have all the access on GitHub and DNSimple required to make it |
| + happen.”</td> |
| + <td>Mirrored the Pterodon microblog (113 posts plus replies), built this site, |
| + created the <a href="https://github.com/paulca/paulca.com">paulca/paulca.com</a> |
| + repo, enabled GitHub Pages, and switched DNS from the old Rails server to |
| + GitHub Pages. About 40 model invocations.</td> |
| + <td>~40 Wh</td> |
| + <td>~16 g</td> |
| +</tr> |
| +<tr> |
| + <td>July 21, 2026</td> |
| + <td>“Put Mastodon https://mastodon.social/@paulca above BlueSky, lose |
| + Twitter.”</td> |
| + <td>Reordered the links on the home page. About 6 model invocations.</td> |
| + <td>~6 Wh</td> |
| + <td>~2.5 g</td> |
| +</tr> |
| +<tr> |
| + <td>July 21, 2026</td> |
| + <td>“Can I add a prompt and carbon-use ledger to this site?”</td> |
| + <td>Added this page. About 8 model invocations.</td> |
| + <td>~8 Wh</td> |
| + <td>~3 g</td> |
| +</tr> |
| +</table> |
| + |
| +<p><b>Running total:</b> ~54 Wh, ~22 g CO₂e — roughly the energy it takes |
| +to boil half a litre of water, or the emissions of driving a petrol car about 150 |
| +metres.</p> |
| + |
| +<h2>Method</h2> |
| + |
| +<p>Anthropic doesn't publish per-request energy figures, so these are |
| +order-of-magnitude estimates, not measurements. The arithmetic: |
| +<i>(model invocations in the session) × 1 Wh per invocation × |
| +400 g CO₂e per kWh</i> (a rough global-average grid intensity). Published |
| +measurements for single chat queries are around 0.24–0.33 Wh |
| +(Google's 2025 Gemini disclosure); 1 Wh per invocation is deliberately |
| +generous because agentic coding calls carry much longer contexts than chat. |
| +Training-run amortisation, network transfer, and this page being served are not |
| +counted. Treat every number as right to within a factor of ten, at best.</p> |
| + |
| +<p>The ledger is append-only: each time the agent works on this site, it adds a row.</p> |
| + |
| +<hr> |
| + |
| +<p><a href="/">Home</a></p> |
| + |
| +</body> |
| +</html> |
amadan