On kayak.com, advertising and tracking add ≈ 12,192 g CO₂ per million pageviews (4,308 g from ad-serving alone) — 2.3× the index average, cleaner than 12% of the sites we measure.
Ad-relevant
12192
g CO₂ / 1M pageviews
Ad-serving only
4308
g CO₂ / 1M pageviews
146
kg CO₂ / year at 1M pageviews per month
12
% cleaner than the DACH index
65
% 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 →