On claude.ai, advertising and tracking add ≈ 4,420 g CO₂ per million pageviews (847 g from ad-serving alone) — 0.8× the index average, cleaner than 34% of the sites we measure.
Ad-relevant
4420
g CO₂ / 1M pageviews
Ad-serving only
847
g CO₂ / 1M pageviews
53
kg CO₂ / year at 1M pageviews per month
34
% cleaner than the DACH index
81
% of the footprint is tracking overhead, not ad-serving
Measured on the live electricity grid from public page-load data — an estimate of a site's ad-tech architecture, not a measured campaign figure. See the methodology →