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

Checks

2 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.79g CO2 per view

FIX

1.79g CO2 per view

1.79g CO2 per page view

This page transfers 6.3 MB, producing an estimated 1.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.33g, network 0.31g, end-user device 1.15g.

Got: 1.79g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 215.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 215.1 kg of CO2 annually — equivalent to charging 26890 smartphones.

1.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 16% of websites

Sustainable Web Design model v4 · Page size: 6.3 MB

Your site

1.79g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.33g

Network

0.31g

End-user device

1.15g

At 10,000 monthly views: Monthly: 17.9 kg · Annual: 215.1 kg · ≈ 26890 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

84th percentile

FIX

84th percentile

1.79g CO2 — above the median website (0.60g)

Heavier than an estimated 16% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 84th percentile

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

Top 10%

Target

Median website

1.79g

84th percentile

Cleaner than 16% of websites

✗ Above the median website

vs Median 199% more

vs Target 259% more

Web Font Weight Variants

Action

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

REVIEW

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

23 font weights loaded -- likely 100+ KB of unused payload

Loading 23 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Open Sans.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 128 KB (vs 6482 KB first visit). 315 of 318 resources are served from browser cache, saving 1.76g CO2 per repeat visit.

Repeat visit: 0.04g CO2 (first visit: 1.79g)

First visit

6482 KB

Repeat visit

128 KB

98% reduction on repeat visits

Saving 1.76g CO2 per returning visitor

315 resources served from cache · 3 resources re-downloaded

A+

Transfer Efficiency

95% efficient

PASS

95% efficient

Transfer efficiency: 95%

Only 304 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 304 KB (5% of page weight)

Unused JS 304 KB

0.08g unnecessary CO2 per visit

Actual transfer 6482 KB

Theoretical minimum 6177 KB

Potential savings 304 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

1 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

1 missing lazy loading

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