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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
75
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 3 REVIEW 2 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
53th percentile
FIX
53th percentile
Warning::
0.73g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.73g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 22% more
vs Target 46% more
B
CO2 Per Page Load
0.73g CO2 per view
REVIEW
0.73g CO2 per view
Info::
0.73g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.47g.
Got: 0.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 87.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 87.6 kg of CO2 annually — equivalent to charging 10945 smartphones.

0.73g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
0.13g
End-user device
0.47g
At 10,000 monthly views: Monthly: 7.3 kg · Annual: 87.6 kg · ≈ 10945 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 167 KB (vs 2638 KB first visit). 173 of 177 resources are served from browser cache, saving 0.68g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.73g)
First visit
2638 KB
Repeat visit
167 KB

94% reduction on repeat visits

Saving 0.68g CO2 per returning visitor

173 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 232 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 232 KB (9% of page weight)

Unused JS 232 KB

0.06g unnecessary CO2 per visit

Actual transfer 2638 KB
Theoretical minimum 2405 KB
Potential savings 232 KB (0.06g 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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