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

4 PASS 1 REVIEW 2 FIX

CO2 Per Page Load

Action

1.43g CO2 per view

FIX

1.43g CO2 per view

1.43g CO2 per page view

This page transfers 6.0 MB, producing an estimated 1.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.10g.

Got: 1.43g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 171.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 171.4 kg of CO2 annually — equivalent to charging 21431 smartphones.

Green hosting reduces data center emissions

1.43g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 6.0 MB

Your site

1.43g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.04g

Network

0.30g

End-user device

1.10g

At 10,000 monthly views: Monthly: 14.3 kg · Annual: 171.4 kg · ≈ 21431 smartphone charges

Carbon Budget

Action

73th percentile

FIX

73th percentile

1.43g CO2 — above the median website (0.60g)

Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 73th percentile

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

Top 10%

Target

Median website

1.43g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 138% more

vs Target 186% more

Transfer Efficiency

82% efficient

REVIEW

82% efficient

Transfer efficiency: 82%

An estimated 1139 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1139 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.

Total waste: 1139 KB (18% of page weight)

Unused JS 1139 KB

0.26g unnecessary CO2 per visit

Actual transfer 6181 KB

Theoretical minimum 5041 KB

Potential savings 1139 KB (0.26g CO2)

See Deep Analysis sections above for specific optimizations.

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 94 KB (vs 6181 KB first visit). 395 of 400 resources are served from browser cache, saving 1.41g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 1.43g)

First visit

6181 KB

Repeat visit

94 KB

98% reduction on repeat visits

Saving 1.41g CO2 per returning visitor

395 resources served from cache · 5 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

64 images, 1049 KB total, 142 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1049 KB

Oversized

Wasted

142 KB

5 missing alt text 11 missing dimensions 18 missing lazy loading

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