Blog

The questions people ask about AI’s footprint, answered with numbers.

Water, energy and carbon, per query and per token, with the sources named and the method published. Written by the people who build the meter.

ResearchCalculator10 min read

LLM market share in tokens: a year of OpenRouter

Which models run the most AI traffic, measured in tokens: 1.3 quadrillion tokens through OpenRouter in eleven months, who gained share, and what it emits.

Cory Bergh · 9 September 2026

How-to7 min read

How to check your Codex usage, and what it costs in tokens

Where Codex shows your usage and limits, how the 5-hour window, weekly cap and credits work, and how to meter what Codex spends in tokens, energy and CO2e.

Cory Bergh · 7 September 2026

Guide7 min read

The GHG Protocol and AI: reporting the tokens you buy

What the GHG Protocol is, its standards and three scopes, and how AI inference is measured and reported under it, per token, with a stated uncertainty.

Cory Bergh · 4 September 2026

Guide7 min read

Scope 3 emissions and AI: where usage goes, how to count it

What Scope 3 emissions are, which category purchased AI inference falls under, which rules make reporting mandatory, and how tokens become a defensible line.

Cory Bergh · 2 September 2026

Explainer9 min read

Is AI bad for the environment? The numbers, both ways

Per use, AI’s electricity, water and carbon are tiny; in total they are among the fastest growing loads on the grid. The measured numbers and what changes them.

Cory Bergh · 31 August 2026

ExplainerCalculator9 min read

Data center water usage: the numbers, on site and upstream

How much water US data centers use, on site and at the power plant, from Berkeley Lab’s 2024 report, Google and Microsoft’s own figures, and a calculator.

Cory Bergh · 28 August 2026

ExplainerCalculator9 min read

How much water does ChatGPT use? The numbers, per query

Per query, per day and per year: what OpenAI, Google and independent researchers report for the water behind a ChatGPT answer, and how to measure your own.

Cory Bergh · 26 August 2026

ExplainerCalculator9 min read

How much energy does AI use? Per query, per year, per token

What a ChatGPT query, a Gemini prompt and a year of data centres actually use, from OpenAI, Google, the IEA and Berkeley Lab, and what our meter says per token.

Cory Bergh · 24 August 2026

GuideCalculator9 min read

AI carbon footprint: what it is and how to measure it

A guide to the carbon footprint of AI usage: what a query and a million tokens emit, the three layers auditors ask about, and how to measure and report yours.

Cory Bergh · 21 August 2026

See your own number instead of ours.

However your team already runs AI, that is how you connect. Paste a read-only provider key, drop in an SDK, add the MCP server, install the CLI or switch on the browser extension, and the first measured tokens reach your dashboard within seconds.

Create your free account

Free plan · first tokens in seconds