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

37th percentile

REVIEW

37th percentile

0.48g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 37th percentile

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

Top 10%

Target

Median website

0.48g

37th percentile

Cleaner than 63% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 21% cleaner ✓

vs Target 5% cleaner ✓

Transfer Efficiency

86% efficient

REVIEW

86% efficient

Transfer efficiency: 86%

An estimated 280 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 280 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.

Total waste: 280 KB (14% of page weight)

Unused JS 280 KB

0.06g unnecessary CO2 per visit

Actual transfer 2059 KB

Theoretical minimum 1779 KB

Potential savings 280 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.48g CO2 per view

PASS

0.48g CO2 per view

0.48g CO2 per page view

This page transfers 2.0 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.37g.

Got: 0.48g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 57.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 57.1 kg of CO2 annually — equivalent to charging 7141 smartphones.

Green hosting reduces data center emissions

0.48g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 63% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site

0.48g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.10g

End-user device

0.37g

At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.1 kg · ≈ 7141 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Cloudflare CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

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 Not identified✗CDN Cloudflare✓

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 36 KB (vs 2059 KB first visit). 59 of 60 resources are served from browser cache, saving 0.47g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.48g)

First visit

2059 KB

Repeat visit

36 KB

98% reduction on repeat visits

Saving 0.47g CO2 per returning visitor

59 resources served from cache · 1 resources re-downloaded

A+

Web Font Weight Variants

4 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

4 font weights loaded across 1 famil(y/ies) -- reasonable

4 font weight(s) loaded across 1 famil(y/ies)

Image Optimization

51 images, 2611 KB total, 668 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

2611 KB

Oversized

Wasted

668 KB

18 missing dimensions 20 missing lazy loading

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