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

1.42g CO2 per view

FIX

1.42g CO2 per view

1.42g CO2 per page view

This page transfers 5.0 MB, producing an estimated 1.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.26g, network 0.25g, end-user device 0.91g.

Got: 1.42g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 170.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 170.2 kg of CO2 annually — equivalent to charging 21279 smartphones.

1.42g

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

1.42g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.26g

Network

0.25g

End-user device

0.91g

At 10,000 monthly views: Monthly: 14.2 kg · Annual: 170.2 kg · ≈ 21279 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

73th percentile

FIX

73th percentile

1.42g 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

1.42g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 136% more

vs Target 184% more

Transfer Efficiency

78% efficient

REVIEW

78% efficient

Transfer efficiency: 78%

An estimated 1115 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1115 KB of unused JavaScript. This wasted data produces 0.31g of unnecessary CO2 per page view.

Total waste: 1115 KB (22% of page weight)

Unused JS 1115 KB

0.31g unnecessary CO2 per visit

Actual transfer 5129 KB

Theoretical minimum 4013 KB

Potential savings 1115 KB (0.31g 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

89% cached

PASS

89% cached

89% reduction on repeat visits

Returning visitors download only 546 KB (vs 5129 KB first visit). 234 of 239 resources are served from browser cache, saving 1.27g CO2 per repeat visit.

Repeat visit: 0.15g CO2 (first visit: 1.42g)

First visit

5129 KB

Repeat visit

546 KB

89% reduction on repeat visits

Saving 1.27g CO2 per returning visitor

234 resources served from cache · 5 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

75 images, 397 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

397 KB

67 missing dimensions 74 missing lazy loading

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