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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
2
PASS
3
INFO
0
Checks
7
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.61g CO2 per view
FIX
1.61g CO2 per view
Warning::
1.61g CO2 per page view
This page transfers 6.8 MB, producing an estimated 1.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.24g.
Got: 1.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 193.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 193.7 kg of CO2 annually — equivalent to charging 24211 smartphones.
Info::
Green hosting reduces data center emissions

1.61g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 22% of websites

Sustainable Web Design model v4 · Page size: 6.8 MB

Your site
1.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.33g
End-user device
1.24g
At 10,000 monthly views: Monthly: 16.1 kg · Annual: 193.7 kg · ≈ 24211 smartphone charges
F
Carbon Budget
Action
78th percentile
FIX
78th percentile
Warning::
1.61g CO2 — above the median website (0.60g)
Heavier than an estimated 22% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 78th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.61g

78th percentile

Cleaner than 22% of websites

✗ Above the median website

vs Median 169% more
vs Target 223% 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+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Vercel, CDN: Vercel
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Info::
Vercel: Hosted on AWS/Google Cloud with 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 Hosting✓ Green Hosted
Hosting Vercel✓CDN Vercel✓

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 11 KB (vs 6983 KB first visit). 97 of 99 resources are served from browser cache, saving 1.61g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.61g)
First visit
6983 KB
Repeat visit
11 KB

100% reduction on repeat visits

Saving 1.61g CO2 per returning visitor

97 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 28 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 28 KB (0% of page weight)

Unused JS 28 KB

0.01g unnecessary CO2 per visit

Actual transfer 6983 KB
Theoretical minimum 6954 KB
Potential savings 28 KB (0.01g 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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