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

3.91g CO2 per view

FIX

3.91g CO2 per view

3.91g CO2 per page view

This page transfers 13.8 MB, producing an estimated 3.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.72g, network 0.68g, end-user device 2.51g.

Got: 3.91g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 469.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 469.8 kg of CO2 annually — equivalent to charging 58720 smartphones.

3.91g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 13.8 MB

Your site

3.91g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.72g

Network

0.68g

End-user device

2.51g

At 10,000 monthly views: Monthly: 39.1 kg · Annual: 469.8 kg · ≈ 58720 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

3.91g 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

3.91g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 552% more

vs Target 683% more

Web Font Weight Variants

5 font weights loaded across 1 famil(y/ies)

REVIEW

5 font weights loaded across 1 famil(y/ies)

5 font weights loaded -- review whether all are used

5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Lato.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

92% cached

PASS

92% cached

92% reduction on repeat visits

Returning visitors download only 1160 KB (vs 14154 KB first visit). 89 of 90 resources are served from browser cache, saving 3.59g CO2 per repeat visit.

Repeat visit: 0.32g CO2 (first visit: 3.91g)

First visit

14154 KB

Repeat visit

1160 KB

92% reduction on repeat visits

Saving 3.59g CO2 per returning visitor

89 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

95% efficient

PASS

95% efficient

Transfer efficiency: 95%

Only 693 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 693 KB (5% of page weight)

Unused JS 693 KB

0.19g unnecessary CO2 per visit

Actual transfer 14154 KB

Theoretical minimum 13461 KB

Potential savings 693 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

23 images, 7940 KB total, 4896 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

7940 KB

Oversized

Wasted

4896 KB

21 missing dimensions 13 missing lazy loading

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