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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
92
GRADE
A
FIX
0
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 REVIEW
B
Carbon Budget
37th percentile
REVIEW
37th percentile
Info::
0.48g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.48g

37th percentile

Cleaner than 63% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 21% cleaner ✓
vs Target 5% cleaner ✓
C
Transfer Efficiency
Action
64% efficient
REVIEW
64% efficient
Warning::
Transfer efficiency: 64%
An estimated 748 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 748 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
64% efficient

Total waste: 748 KB (36% of page weight)

Unused JS 748 KB

0.17g unnecessary CO2 per visit

Actual transfer 2055 KB
Theoretical minimum 1307 KB
Potential savings 748 KB (0.17g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.48g CO2 per view
PASS
0.48g CO2 per view
Info::
0.48g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.36g.
Got: 0.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 57.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 57.0 kg of CO2 annually — equivalent to charging 7126 smartphones.
Info::
Green hosting reduces data center emissions

0.48g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 63% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site
0.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.0 kg · ≈ 7126 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 70 KB (vs 2055 KB first visit). 237 of 253 resources are served from browser cache, saving 0.46g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.48g)
First visit
2055 KB
Repeat visit
70 KB

97% reduction on repeat visits

Saving 0.46g CO2 per returning visitor

237 resources served from cache · 16 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.

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