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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
0.87g CO2 per view
FIX
0.87g CO2 per view
Info::
0.87g CO2 per page view
This page transfers 3.1 MB, producing an estimated 0.87g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.16g, network 0.15g, end-user device 0.56g.
Got: 0.87g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 105.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 105.0 kg of CO2 annually — equivalent to charging 13119 smartphones.

0.87g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.1 MB

Your site
0.87g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.16g
Network
0.15g
End-user device
0.56g
At 10,000 monthly views: Monthly: 8.7 kg · Annual: 105.0 kg · ≈ 13119 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.87g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.87g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 46% more
vs Target 75% more
B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 94 KB (vs 3162 KB first visit). 61 of 62 resources are served from browser cache, saving 0.85g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.87g)
First visit
3162 KB
Repeat visit
94 KB

97% reduction on repeat visits

Saving 0.85g CO2 per returning visitor

61 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 131 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 131 KB (4% of page weight)

Unused JS 131 KB

0.04g unnecessary CO2 per visit

Actual transfer 3162 KB
Theoretical minimum 3031 KB
Potential savings 131 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

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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