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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
68
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.30g CO2 per view
FIX
1.30g CO2 per view
Warning::
1.30g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.23g, end-user device 0.84g.
Got: 1.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 156.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 156.3 kg of CO2 annually — equivalent to charging 19532 smartphones.

1.30g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.23g
End-user device
0.84g
At 10,000 monthly views: Monthly: 13.0 kg · Annual: 156.3 kg · ≈ 19532 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 WordPress.com✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.30g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.30g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 117% more
vs Target 160% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 40 KB (vs 4708 KB first visit). 71 of 72 resources are served from browser cache, saving 1.29g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.30g)
First visit
4708 KB
Repeat visit
40 KB

99% reduction on repeat visits

Saving 1.29g CO2 per returning visitor

71 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 448 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 448 KB (10% of page weight)

Unused JS 448 KB

0.12g unnecessary CO2 per visit

Actual transfer 4708 KB
Theoretical minimum 4259 KB
Potential savings 448 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
14 images, 1849 KB total, 40 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

1849 KB

Oversized

1

Wasted

40 KB

1 missing dimensions 4 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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