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 2 REVIEW 2 FIX

CO2 Per Page Load

Action

1.01g CO2 per view

FIX

1.01g CO2 per view

1.01g CO2 per page view

This page transfers 4.2 MB, producing an estimated 1.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.77g.

Got: 1.01g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 120.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 120.6 kg of CO2 annually — equivalent to charging 15076 smartphones.

Green hosting reduces data center emissions

1.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 39% of websites

Sustainable Web Design model v4 · Page size: 4.2 MB

Your site

1.01g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.03g

Network

0.21g

End-user device

0.77g

At 10,000 monthly views: Monthly: 10.1 kg · Annual: 120.6 kg · ≈ 15076 smartphone charges

Carbon Budget

Action

61th percentile

FIX

61th percentile

1.01g CO2 — above the median website (0.60g)

Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 61th percentile

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

Top 10%

Target

Median website

1.01g

61st percentile

Cleaner than 39% of websites

✗ Above the median website

vs Median 68% more

vs Target 101% more

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Cloudflare uses renewable energy

Cloudflare: Verified by the Green Web Foundation

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 Not identified✗

Cloudflare: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Transfer Efficiency

81% efficient

REVIEW

81% efficient

Transfer efficiency: 81%

An estimated 835 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 835 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.

Total waste: 835 KB (19% of page weight)

Unused JS 835 KB

0.19g unnecessary CO2 per visit

Actual transfer 4348 KB

Theoretical minimum 3513 KB

Potential savings 835 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 40 KB (vs 4348 KB first visit). 74 of 75 resources are served from browser cache, saving 1.00g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 1.01g)

First visit

4348 KB

Repeat visit

40 KB

99% reduction on repeat visits

Saving 1.00g CO2 per returning visitor

74 resources served from cache · 1 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)

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

9 images, 1059 KB total, 553 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1059 KB

Oversized

Wasted

553 KB

9 missing dimensions 4 missing lazy loading

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