Why Website Carbon Emissions Matter in 2026

The internet accounts for approximately 3.7% of global greenhouse gas emissions — comparable to the aviation industry. As the EU Green Claims Directive, CSRD and consumer expectations push companies toward measurable sustainability commitments, adding a carbon footprint badge to your website is both a technical and marketing move.

How Website Carbon is Calculated

The calculation methodology used by most tools follows the Sustainable Web Design (SWD) model v4, which considers:

Data transfer per page view (measured in MB)

Grid carbon intensity (gCO₂/kWh, varies by country and CDN location)

Device energy (estimated from transfer volume)

Network infrastructure energy

The standard formula yields a result in grams of CO₂ per page view. A lean page (under 500KB) typically produces 0.1–0.3g CO₂/visit.…