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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
1
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
6
5 PASS 1 REVIEW
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 228 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 228 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
83% efficient

Total waste: 228 KB (17% of page weight)

Unused JS 228 KB

0.05g unnecessary CO2 per visit

Actual transfer 1378 KB
Theoretical minimum 1150 KB
Potential savings 228 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.32g CO2 per view
PASS
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.24g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.2 kg of CO2 annually — equivalent to charging 4779 smartphones.
Info::
Green hosting reduces data center emissions

0.32g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 79% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.24g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.2 kg · ≈ 4779 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
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 Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 69 KB (vs 1378 KB first visit). 76 of 79 resources are served from browser cache, saving 0.30g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.32g)
First visit
1378 KB
Repeat visit
69 KB

95% reduction on repeat visits

Saving 0.30g CO2 per returning visitor

76 resources served from cache · 3 resources re-downloaded

A
Carbon Budget
21th percentile
PASS
21th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 79% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 21th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.32g

21st percentile

Cleaner than 79% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 47% cleaner ✓
vs Target 36% cleaner ✓
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.

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