On xero.com, advertising and tracking add ≈ 5,634 g CO₂ per million pageviews (76 g from ad-serving alone) — 1.1× the index average, cleaner than 28% of the sites we measure.
Ad-relevant
5634
g CO₂ / 1M pageviews
Ad-serving only
76
g CO₂ / 1M pageviews
68
kg CO₂ / year at 1M pageviews per month
28
% cleaner than the DACH index
99
% 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 →