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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 3 REVIEW 2 FIX
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
52th percentile
FIX
52th percentile
Warning::
0.70g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.70g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 17% more
vs Target 41% more
B
CO2 Per Page Load
0.70g CO2 per view
REVIEW
0.70g CO2 per view
Info::
0.70g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.45g.
Got: 0.70g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 84.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 84.5 kg of CO2 annually — equivalent to charging 10559 smartphones.

0.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.70g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 7.0 kg · Annual: 84.5 kg · ≈ 10559 smartphone charges
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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 48 KB (vs 2545 KB first visit). 79 of 81 resources are served from browser cache, saving 0.69g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.70g)
First visit
2545 KB
Repeat visit
48 KB

98% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

79 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 91 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 91 KB (4% of page weight)

Unused JS 91 KB

0.03g unnecessary CO2 per visit

Actual transfer 2545 KB
Theoretical minimum 2454 KB
Potential savings 91 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
49 images, 1821 KB total, 125 KB wasted
INFO

Image Optimization Audit

Total Images

49

Total Size

1821 KB

Oversized

6

Wasted

125 KB

35 missing alt text 40 missing lazy loading
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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