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

1.48g CO2 per view

FIX

1.48g CO2 per view

1.48g CO2 per page view

This page transfers 5.2 MB, producing an estimated 1.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.95g.

Got: 1.48g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 177.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 177.0 kg of CO2 annually — equivalent to charging 22127 smartphones.

1.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site

1.48g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.27g

Network

0.25g

End-user device

0.95g

At 10,000 monthly views: Monthly: 14.8 kg · Annual: 177.0 kg · ≈ 22127 smartphone charges

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

75th percentile

FIX

75th percentile

1.48g CO2 — above the median website (0.60g)

Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 75th percentile

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

Top 10%

Target

Median website

1.48g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 146% more

vs Target 195% more

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

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 47 KB (vs 5333 KB first visit). 134 of 136 resources are served from browser cache, saving 1.46g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 1.48g)

First visit

5333 KB

Repeat visit

47 KB

99% reduction on repeat visits

Saving 1.46g CO2 per returning visitor

134 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

90% efficient

PASS

90% efficient

Transfer efficiency: 90%

Only 508 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 508 KB (10% of page weight)

Unused JS 508 KB

0.14g unnecessary CO2 per visit

Actual transfer 5333 KB

Theoretical minimum 4825 KB

Potential savings 508 KB (0.14g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

16 images, 2313 KB total, 666 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

2313 KB

Oversized

Wasted

666 KB

2 missing lazy loading

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