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

3 PASS 4 REVIEW

CO2 Per Page Load

0.54g CO2 per view

REVIEW

0.54g CO2 per view

0.54g CO2 per page view

This page transfers 2.3 MB, producing an estimated 0.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.42g.

Got: 0.54g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 64.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 64.9 kg of CO2 annually — equivalent to charging 8110 smartphones.

Green hosting reduces data center emissions

0.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 56% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site

0.54g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.11g

End-user device

0.42g

At 10,000 monthly views: Monthly: 5.4 kg · Annual: 64.9 kg · ≈ 8110 smartphone charges

Carbon Budget

44th percentile

REVIEW

44th percentile

0.54g CO2 — below the median website (0.60g)

Better than an estimated 56% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 44th percentile

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

Top 10%

Target

Median website

0.54g

44th percentile

Cleaner than 56% of websites

✗ Above the median website

vs Median 10% cleaner ✓

vs Target 8% more

Transfer Efficiency

90% efficient

REVIEW

90% efficient

Transfer efficiency: 90%

An estimated 233 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 233 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.

Total waste: 233 KB (10% of page weight)

Unused JS 233 KB

0.05g unnecessary CO2 per visit

Actual transfer 2339 KB

Theoretical minimum 2105 KB

Potential savings 233 KB (0.05g 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

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

82% cached

PASS

82% cached

82% reduction on repeat visits

Returning visitors download only 431 KB (vs 2339 KB first visit). 285 of 306 resources are served from browser cache, saving 0.44g CO2 per repeat visit.

Repeat visit: 0.10g CO2 (first visit: 0.54g)

First visit

2339 KB

Repeat visit

431 KB

82% reduction on repeat visits

Saving 0.44g CO2 per returning visitor

285 resources served from cache · 21 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 2 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 2 famil(y/ies) -- reasonable

2 font weight(s) loaded across 2 famil(y/ies)

Image Optimization

109 images, 112 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

109

Total Size

112 KB

103 missing lazy loading

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