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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
78
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
8
4 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
10.67g CO2 per view
FIX
10.67g CO2 per view
Critical::
10.67g CO2 per page view
This page transfers 45.1 MB, producing an estimated 10.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 2.21g, end-user device 8.20g.
Got: 10.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1280.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1280.4 kg of CO2 annually — equivalent to charging 160053 smartphones.
Info::
Green hosting reduces data center emissions

10.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 45.1 MB

Your site
10.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
2.21g
End-user device
8.20g
At 10,000 monthly views: Monthly: 106.7 kg · Annual: 1280.4 kg · ≈ 160053 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
10.67g 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

10.67g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1678% more
vs Target 2034% 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.
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 52 KB (vs 46163 KB first visit). 140 of 144 resources are served from browser cache, saving 10.66g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 10.67g)
First visit
46163 KB
Repeat visit
52 KB

100% reduction on repeat visits

Saving 10.66g CO2 per returning visitor

140 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 845 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 845 KB (2% of page weight)

Unused JS 845 KB

0.20g unnecessary CO2 per visit

Actual transfer 46163 KB
Theoretical minimum 45318 KB
Potential savings 845 KB (0.20g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Image Optimization
1 images, 6 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

6 KB

1 missing dimensions 1 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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