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

5.16g CO2 per view

FIX

5.16g CO2 per view

5.16g CO2 per page view

This page transfers 18.2 MB, producing an estimated 5.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.95g, network 0.89g, end-user device 3.31g.

Got: 5.16g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 618.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 618.7 kg of CO2 annually — equivalent to charging 77338 smartphones.

5.16g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 18.2 MB

Your site

5.16g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.95g

Network

0.89g

End-user device

3.31g

At 10,000 monthly views: Monthly: 51.6 kg · Annual: 618.7 kg · ≈ 77338 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

95th percentile

FIX

95th percentile

5.16g 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

5.16g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 759% more

vs Target 931% 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

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 46 KB (vs 18642 KB first visit). 154 of 157 resources are served from browser cache, saving 5.14g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 5.16g)

First visit

18642 KB

Repeat visit

46 KB

100% reduction on repeat visits

Saving 5.14g CO2 per returning visitor

154 resources served from cache · 3 resources re-downloaded

A+

Transfer Efficiency

99% efficient

PASS

99% efficient

Transfer efficiency: 99%

Only 246 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 246 KB (1% of page weight)

Unused JS 246 KB

0.07g unnecessary CO2 per visit

Actual transfer 18642 KB

Theoretical minimum 18396 KB

Potential savings 246 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

57 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

56 missing lazy loading

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