Sustainability

· 6 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 3 REVIEW

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

AWS uses renewable energy

AWS: Verified by the Green Web Foundation

AWS CloudFront: Renewable varies by edge location

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 AWS✓CDN AWS CloudFront✗

AWS: Verified by the Green Web Foundation

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

38th percentile

REVIEW

38th percentile

0.49g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 62% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 38th percentile

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

Top 10%

Target

Median website

0.49g

38th percentile

Cleaner than 62% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 19% cleaner ✓

vs Target 3% cleaner ✓

Transfer Efficiency

88% efficient

REVIEW

88% efficient

Transfer efficiency: 88%

An estimated 245 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 245 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.

Total waste: 245 KB (12% of page weight)

Unused JS 245 KB

0.06g unnecessary CO2 per visit

Actual transfer 2100 KB

Theoretical minimum 1854 KB

Potential savings 245 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

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 0.37g.

Got: 0.49g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 58.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 58.3 kg of CO2 annually — equivalent to charging 7283 smartphones.

Green hosting reduces data center emissions

0.49g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 62% 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

0.37g

At 10,000 monthly views: Monthly: 4.9 kg · Annual: 58.3 kg · ≈ 7283 smartphone charges

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 54 KB (vs 2100 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: 0.49g)

First visit

2100 KB

Repeat visit

54 KB

97% reduction on repeat visits

Saving 0.47g CO2 per returning visitor

59 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

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