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

0.49g 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

0.49g

39th percentile

Cleaner than 61% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 18% cleaner ✓

vs Target 1% cleaner ✓

Transfer Efficiency

Action

71% efficient

REVIEW

71% efficient

Transfer efficiency: 71%

An estimated 610 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 610 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.

Total waste: 610 KB (29% of page weight)

Unused JS 610 KB

0.14g unnecessary CO2 per visit

Actual transfer 2132 KB

Theoretical minimum 1522 KB

Potential savings 610 KB (0.14g 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

0.49g CO2 per view

PASS

0.49g CO2 per view

0.49g CO2 per page view

This page transfers 2.1 MB, producing an estimated 0.49g 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: 0.49g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 59.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 59.2 kg of CO2 annually — equivalent to charging 7395 smartphones.

Green hosting reduces data center emissions

0.49g

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

0.49g

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: 4.9 kg · Annual: 59.2 kg · ≈ 7395 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

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 73 KB (vs 2132 KB first visit). 137 of 138 resources are served from browser cache, saving 0.48g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.49g)

First visit

2132 KB

Repeat visit

73 KB

97% reduction on repeat visits

Saving 0.48g CO2 per returning visitor

137 resources served from cache · 1 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

35 images, 13 KB total, 13 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

13 KB

Oversized

Wasted

13 KB

5 missing alt text 23 missing dimensions 34 missing lazy loading

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