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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
71
GRADE
C
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
1.72g CO2 per view
FIX
1.72g CO2 per view
Warning::
1.72g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.10g.
Got: 1.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 206.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 206.3 kg of CO2 annually — equivalent to charging 25793 smartphones.

1.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 19% of websites

Sustainable Web Design model v4 · Page size: 6.1 MB

Your site
1.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.10g
At 10,000 monthly views: Monthly: 17.2 kg · Annual: 206.3 kg · ≈ 25793 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

F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.72g CO2 — above the median website (0.60g)
Heavier than an estimated 19% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 81th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.72g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 187% more
vs Target 244% 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 59 KB (vs 6217 KB first visit). 99 of 103 resources are served from browser cache, saving 1.70g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.72g)
First visit
6217 KB
Repeat visit
59 KB

99% reduction on repeat visits

Saving 1.70g CO2 per returning visitor

99 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 470 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 470 KB (8% of page weight)

Unused JS 470 KB

0.13g unnecessary CO2 per visit

Actual transfer 6217 KB
Theoretical minimum 5747 KB
Potential savings 470 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
13 images, 652 KB total, 40 KB wasted
INFO

Image Optimization Audit

Total Images

13

Total Size

652 KB

Oversized

1

Wasted

40 KB

2 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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