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

CO2 Per Page Load

0.51g CO2 per view

REVIEW

0.51g CO2 per view

0.51g CO2 per page view

This page transfers 2.1 MB, producing an estimated 0.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.39g.

Got: 0.51g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 60.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 60.9 kg of CO2 annually — equivalent to charging 7612 smartphones.

Green hosting reduces data center emissions

0.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 60% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site

0.51g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.10g

End-user device

0.39g

At 10,000 monthly views: Monthly: 5.1 kg · Annual: 60.9 kg · ≈ 7612 smartphone charges

Carbon Budget

40th percentile

REVIEW

40th percentile

0.51g CO2 — below the median website (0.60g)

Better than an estimated 60% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 40th percentile

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

Top 10%

Target

Median website

0.51g

40th percentile

Cleaner than 60% of websites

✗ Above the median website

vs Median 15% cleaner ✓

vs Target 1% more

Transfer Efficiency

Action

63% efficient

REVIEW

63% efficient

Transfer efficiency: 63%

An estimated 810 KB (37%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 810 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.

Total waste: 810 KB (37% of page weight)

Unused JS 810 KB

0.19g unnecessary CO2 per visit

Actual transfer 2195 KB

Theoretical minimum 1385 KB

Potential savings 810 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Cloudflare, CDN: Fastly

Cloudflare: Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

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 Fastly✓

Cloudflare: Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 81 KB (vs 2195 KB first visit). 101 of 104 resources are served from browser cache, saving 0.49g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.51g)

First visit

2195 KB

Repeat visit

81 KB

96% reduction on repeat visits

Saving 0.49g CO2 per returning visitor

101 resources served from cache · 3 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.