Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

5 PASS 2 REVIEW

Transfer Efficiency

85% efficient

REVIEW

85% efficient

Transfer efficiency: 85%

An estimated 171 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 171 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.

Total waste: 171 KB (15% of page weight)

Unused JS 171 KB

0.04g unnecessary CO2 per visit

Actual transfer 1140 KB

Theoretical minimum 968 KB

Potential savings 171 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

CO2 Per Page Load

0.26g CO2 per view

PASS

0.26g CO2 per view

0.26g CO2 per page view

This page transfers 1.1 MB, producing an estimated 0.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.

Got: 0.26g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 31.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 31.6 kg of CO2 annually — equivalent to charging 3952 smartphones.

Green hosting reduces data center emissions

0.26g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 84% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site

0.26g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.05g

End-user device

0.20g

At 10,000 monthly views: Monthly: 2.6 kg · Annual: 31.6 kg · ≈ 3952 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Cloudflare, CDN: Cloudflare

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Green hosting status based on known provider commitments

Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.

Green Hosting✓ Green Hosted

Hosting Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

94% cached

PASS

94% cached

94% reduction on repeat visits

Returning visitors download only 73 KB (vs 1140 KB first visit). 188 of 189 resources are served from browser cache, saving 0.25g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.26g)

First visit

1140 KB

Repeat visit

73 KB

94% reduction on repeat visits

Saving 0.25g CO2 per returning visitor

188 resources served from cache · 1 resources re-downloaded

Carbon Budget

16th percentile

PASS

16th percentile

0.26g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 16th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.26g

16th percentile

Cleaner than 84% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 56% cleaner ✓

vs Target 47% cleaner ✓

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.