On usps.com, advertising and tracking add ≈ 14,146 g CO₂ per million pageviews (663 g from ad-serving alone) — 2.7× the index average, cleaner than 11% of the sites we measure.
Ad-relevant
14146
g CO₂ / 1M pageviews
Ad-serving only
663
g CO₂ / 1M pageviews
170
kg CO₂ / year at 1M pageviews per month
11
% cleaner than the DACH index
95
% 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 →