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

1.95g CO2 per view

FIX

1.95g CO2 per view

1.95g CO2 per page view

This page transfers 6.9 MB, producing an estimated 1.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.25g.

Got: 1.95g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 234.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 234.6 kg of CO2 annually — equivalent to charging 29318 smartphones.

1.95g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site

1.95g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.36g

Network

0.34g

End-user device

1.25g

At 10,000 monthly views: Monthly: 19.5 kg · Annual: 234.6 kg · ≈ 29318 smartphone charges

Green Hosting

Action

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

88th percentile

FIX

88th percentile

1.95g CO2 — above the median website (0.60g)

Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 88th percentile

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

Top 10%

Target

Median website

1.95g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 226% more

vs Target 291% more

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 1379 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1379 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.

Total waste: 1379 KB (20% of page weight)

Unused JS 1379 KB

0.38g unnecessary CO2 per visit

Actual transfer 7067 KB

Theoretical minimum 5687 KB

Potential savings 1379 KB (0.38g 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

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 88 KB (vs 7067 KB first visit). 115 of 117 resources are served from browser cache, saving 1.93g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 1.95g)

First visit

7067 KB

Repeat visit

88 KB

99% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

115 resources served from cache · 2 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

14 images, 2212 KB total, 1830 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

2212 KB

Oversized

Wasted

1830 KB

14 missing dimensions 4 missing lazy loading

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