The Environmental Cost of AI Search Queries vs Traditional Search

AI answers use more computing than a classic search, but the gap per query is smaller than early estimates suggested. The bigger environmental question is the total: billions of queries a day, and the data centers being built to serve them.

What the published figures say

• Classic search: Google said in 2009 that a search used about 0.3 watt-hours of energy. Search has become more efficient since, though the page now does more.
• AI chat: in June 2025, OpenAI's CEO said an average ChatGPT query uses about 0.34 watt-hours.
• Gemini: in August 2025, Google published a measurement of 0.24 watt-hours for a median text prompt in its Gemini apps, with emissions of about 0.03 grams of CO2 and about 0.26 milliliters of water.

For scale, 0.3 watt-hours is roughly what a modern TV uses in about 10 seconds. Early estimates of around 3 watt-hours per AI query were based on older models and hardware, and are now thought to be too high for typical text answers.

Why estimates vary so much

• Long answers and reasoning modes use far more computing than short ones.
• Images, video and agents cost much more than text.
• What's counted: some figures include cooling and idle servers, others only the chips.
• Companies publish their own numbers, and methods differ.

The total is what matters

Per query, the cost is small. In total, it adds up. The International Energy Agency projected in 2025 that data centers' electricity use could roughly double by 2030, to around 945 terawatt-hours a year, with AI as a major driver. Training large models also uses a lot of energy, though serving answers is a growing share. Water used for cooling matters in dry regions.

What you can do

• Use the right tool. For simple lookups, such as a website, opening hours or a definition, plain search is enough.
• Skip AI answers you don't need. Google's Web filter (More → Web) shows a results page without an AI Overview.
• Be aware of what hiding does. Search Cleaner hides AI Overviews from view, which helps you focus, but hiding happens in your browser after the page loads, so it doesn't stop Google from producing them.
• Don't regenerate answers repeatedly; ask one clear question instead.

Keep it in perspective

A single AI answer is a tiny part of your footprint compared with heating, travel or food. The case for using AI deliberately is less about individual guilt and more about not paying, in energy and accuracy, for answers you didn't need. See how AI Overviews changed search.