On macys.com, advertising and tracking add ≈ 23,638 g CO₂ per million pageviews (8,422 g from ad-serving alone) — 4.5× the index average, cleaner than 4% of the sites we measure.
Ad-relevant
23638
g CO₂ / 1M pageviews
Ad-serving only
8422
g CO₂ / 1M pageviews
284
kg CO₂ / year at 1M pageviews per month
4
% cleaner than the DACH index
64
% 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 →