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 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.41g CO2 per view

FIX

1.41g CO2 per view

1.41g CO2 per page view

This page transfers 5.0 MB, producing an estimated 1.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.26g, network 0.24g, end-user device 0.90g.

Got: 1.41g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 168.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 168.8 kg of CO2 annually — equivalent to charging 21103 smartphones.

1.41g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 5.0 MB

Your site

1.41g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.26g

Network

0.24g

End-user device

0.90g

At 10,000 monthly views: Monthly: 14.1 kg · Annual: 168.8 kg · ≈ 21103 smartphone charges

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.

Akamai: Committed to 50% renewable by 2030

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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

73th percentile

FIX

73th percentile

1.41g 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

1.41g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 134% more

vs Target 181% more

Transfer Efficiency

89% efficient

REVIEW

89% efficient

Transfer efficiency: 89%

An estimated 557 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 557 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.

Total waste: 557 KB (11% of page weight)

Unused JS 557 KB

0.15g unnecessary CO2 per visit

Actual transfer 5086 KB

Theoretical minimum 4529 KB

Potential savings 557 KB (0.15g 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

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 17 KB (vs 5086 KB first visit). 115 of 117 resources are served from browser cache, saving 1.40g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 1.41g)

First visit

5086 KB

Repeat visit

17 KB

100% reduction on repeat visits

Saving 1.40g CO2 per returning visitor

115 resources served from cache · 2 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

19 images, 4296 KB total, 1570 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

4296 KB

Oversized

Wasted

1570 KB

10 missing dimensions 9 missing lazy loading

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