Media and telecoms · rank 85 of 107
BT's website emits 2.78 g of CO2 per visit, 7.7× the worst passing grade.
That is 1.10 g above the cohort median of 1.68 g, and puts the site in the heaviest 25% of the 107 companies ranked this edition.
Grade F on the Sustainable Web Design scale. How grades A+ to F are set.
The numbers behind it
Annual figures cover the 30 pages I measured and estimated organic search traffic only, so the real total is higher. Coverage is published so you can judge how representative the number is.
One visit ≈ a 10-watt LED bulb for 34 minutes. A year of estimated search visits to the pages measured ≈ driving a new car 1.8 million km, or the electricity of 140 Dutch homes. What these numbers mean
Where this site sits in the cohort
Grades A+ to E: up to 0.36 g. No company here.
- A+up to 0.040 g0 companies
- Aup to 0.079 g0 companies
- Bup to 0.145 g0 companies
- Cup to 0.209 g0 companies
- Dup to 0.278 g0 companies
- Eup to 0.359 g0 companies
- Fabove 0.359 g107 companies
BT is the dark bar. The band along the bottom is every passing grade, A+ to E.
Against the other media and telecoms companies
Bars share one scale within the sector, lightest first. See all media and telecoms companies.
Why this company is in the index
Listed because: SBTi net-zero 2041 validated.
Claims: Validated science-based climate target
Inclusion is based on a company's own public claims, never on whether it is a client of mine. How this is measured.
Work at BT? I can show you which pages carry the weight and what it would take to cut it.
Cite this: The Green Blind Spot, 2026-Q3 edition, Baba SEO. https://greenblindspot.com/2026-q3/company/bt-com/