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

2 PASS 4 REVIEW 1 FIX

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

CO2 Per Page Load

0.59g CO2 per view

REVIEW

0.59g CO2 per view

0.59g CO2 per page view

This page transfers 2.1 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.

Got: 0.59g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 71.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 71.1 kg of CO2 annually — equivalent to charging 8893 smartphones.

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site

0.59g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.11g

Network

0.10g

End-user device

0.38g

At 10,000 monthly views: Monthly: 5.9 kg · Annual: 71.1 kg · ≈ 8893 smartphone charges

Carbon Budget

49th percentile

REVIEW

49th percentile

0.59g CO2 — below the median website (0.60g)

Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 49th percentile

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

Top 10%

Target

Median website

0.59g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓

vs Target 19% more

Transfer Efficiency

86% efficient

REVIEW

86% efficient

Transfer efficiency: 86%

An estimated 307 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 307 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.

Total waste: 307 KB (14% of page weight)

Unused JS 307 KB

0.08g unnecessary CO2 per visit

Actual transfer 2143 KB

Theoretical minimum 1836 KB

Potential savings 307 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

95% cached

PASS

95% cached

95% reduction on repeat visits

Returning visitors download only 104 KB (vs 2143 KB first visit). 137 of 144 resources are served from browser cache, saving 0.56g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 0.59g)

First visit

2143 KB

Repeat visit

104 KB

95% reduction on repeat visits

Saving 0.56g CO2 per returning visitor

137 resources served from cache · 7 resources re-downloaded

A+

Web Font Weight Variants

3 font weights loaded across 3 famil(y/ies) -- reasonable

PASS

3 font weights loaded across 3 famil(y/ies) -- reasonable

3 font weight(s) loaded across 3 famil(y/ies)

Image Optimization

26 images, 1191 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1191 KB

23 missing dimensions 21 missing lazy loading

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