On yahoo.com, advertising and tracking add ≈ 40,676 g CO₂ per million pageviews (39,275 g from ad-serving alone) — 7.8× the index average, cleaner than 1% of the sites we measure.
Ad-relevant
40676
g CO₂ / 1M pageviews
Ad-serving only
39275
g CO₂ / 1M pageviews
488
kg CO₂ / year at 1M pageviews per month
1
% cleaner than the DACH index
3
% 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 →