Sustainability

· 8 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

Carbon Budget

33th percentile

REVIEW

33th percentile

0.43g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 33th percentile

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

Top 10%

Target

Median website

0.43g

33rd percentile

Cleaner than 67% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 28% cleaner ✓

vs Target 13% cleaner ✓

Transfer Efficiency

77% efficient

REVIEW

77% efficient

Transfer efficiency: 77%

An estimated 439 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 439 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.

Total waste: 439 KB (23% of page weight)

Unused JS 439 KB

0.10g unnecessary CO2 per visit

Actual transfer 1875 KB

Theoretical minimum 1435 KB

Potential savings 439 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

CO2 Per Page Load

0.43g CO2 per view

PASS

0.43g CO2 per view

0.43g CO2 per page view

This page transfers 1.8 MB, producing an estimated 0.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.33g.

Got: 0.43g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 52.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 52.0 kg of CO2 annually — equivalent to charging 6503 smartphones.

Green hosting reduces data center emissions

0.43g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 67% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site

0.43g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.09g

End-user device

0.33g

At 10,000 monthly views: Monthly: 4.3 kg · Annual: 52.0 kg · ≈ 6503 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

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 29 KB (vs 1875 KB first visit). 114 of 117 resources are served from browser cache, saving 0.43g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.43g)

First visit

1875 KB

Repeat visit

29 KB

98% reduction on repeat visits

Saving 0.43g CO2 per returning visitor

114 resources served from cache · 3 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 1 famil(y/ies) -- reasonable

2 font weight(s) loaded across 1 famil(y/ies)

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

Image Optimization

200 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

0 KB

200 missing dimensions

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