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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
11.94g CO2 per view
FIX
11.94g CO2 per view
Critical::
11.94g CO2 per page view
This page transfers 42.2 MB, producing an estimated 11.94g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 2.21g, network 2.06g, end-user device 7.67g.
Got: 11.94g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1432.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1432.9 kg of CO2 annually — equivalent to charging 179117 smartphones.

11.94g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 42.2 MB

Your site
11.94g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
2.21g
Network
2.06g
End-user device
7.67g
At 10,000 monthly views: Monthly: 119.4 kg · Annual: 1432.9 kg · ≈ 179117 smartphone charges
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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
11.94g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

11.94g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1890% more
vs Target 2288% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 30 KB (vs 43177 KB first visit). 58 of 59 resources are served from browser cache, saving 11.93g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 11.94g)
First visit
43177 KB
Repeat visit
30 KB

100% reduction on repeat visits

Saving 11.93g CO2 per returning visitor

58 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 133 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 133 KB (0% of page weight)

Unused JS 133 KB

0.04g unnecessary CO2 per visit

Actual transfer 43177 KB
Theoretical minimum 43043 KB
Potential savings 133 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
6 images, 355 KB total, 354 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

355 KB

Oversized

2

Wasted

354 KB

3 missing dimensions 5 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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