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

2.41g CO2 per view

FIX

2.41g CO2 per view

2.41g CO2 per page view

This page transfers 8.5 MB, producing an estimated 2.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.45g, network 0.42g, end-user device 1.55g.

Got: 2.41g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 289.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 289.7 kg of CO2 annually — equivalent to charging 36216 smartphones.

2.41g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site

2.41g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.45g

Network

0.42g

End-user device

1.55g

At 10,000 monthly views: Monthly: 24.1 kg · Annual: 289.7 kg · ≈ 36216 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

95th percentile

FIX

95th percentile

2.41g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

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

Top 10%

Target

Median website

2.41g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 302% more

vs Target 383% more

Transfer Efficiency

78% efficient

REVIEW

78% efficient

Transfer efficiency: 78%

An estimated 1903 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1903 KB of unused JavaScript. This wasted data produces 0.53g of unnecessary CO2 per page view.

Total waste: 1903 KB (22% of page weight)

Unused JS 1903 KB

0.53g unnecessary CO2 per visit

Actual transfer 8730 KB

Theoretical minimum 6826 KB

Potential savings 1903 KB (0.53g 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 71 KB (vs 8730 KB first visit). 105 of 107 resources are served from browser cache, saving 2.39g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 2.41g)

First visit

8730 KB

Repeat visit

71 KB

99% reduction on repeat visits

Saving 2.39g CO2 per returning visitor

105 resources served from cache · 2 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

28 images, 4207 KB total, 3742 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

4207 KB

Oversized

Wasted

3742 KB

25 missing dimensions 23 missing lazy loading

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