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

4 PASS 3 REVIEW

Carbon Budget

39th percentile

REVIEW

39th percentile

0.50g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 61% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 39th percentile

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

Top 10%

Target

Median website

0.50g

39th percentile

Cleaner than 61% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 17% cleaner ✓

vs Target 0% cleaner ✓

Transfer Efficiency

Action

71% efficient

REVIEW

71% efficient

Transfer efficiency: 71%

An estimated 634 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 634 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.

Total waste: 634 KB (29% of page weight)

Unused JS 634 KB

0.15g unnecessary CO2 per visit

Actual transfer 2157 KB

Theoretical minimum 1523 KB

Potential savings 634 KB (0.15g CO2)

See Deep Analysis sections above for specific optimizations.

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.

CO2 Per Page Load

0.50g CO2 per view

PASS

0.50g CO2 per view

0.50g CO2 per page view

This page transfers 2.1 MB, producing an estimated 0.50g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.38g.

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

At 10,000 monthly views: 59.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 59.8 kg of CO2 annually — equivalent to charging 7478 smartphones.

Green hosting reduces data center emissions

0.50g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 61% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site

0.50g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.10g

End-user device

0.38g

At 10,000 monthly views: Monthly: 5.0 kg · Annual: 59.8 kg · ≈ 7478 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Cloudflare, CDN: Cloudflare

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 Hosting✓ Green Hosted

Hosting Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 42 KB (vs 2157 KB first visit). 127 of 128 resources are served from browser cache, saving 0.49g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.50g)

First visit

2157 KB

Repeat visit

42 KB

98% reduction on repeat visits

Saving 0.49g CO2 per returning visitor

127 resources served from cache · 1 resources re-downloaded

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Image Optimization

1 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

1 missing dimensions 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.