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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
69
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
7
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.91g CO2 per view
FIX
2.91g CO2 per view
Critical::
2.91g CO2 per page view
This page transfers 12.3 MB, producing an estimated 2.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.60g, end-user device 2.24g.
Got: 2.91g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 349.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 349.8 kg of CO2 annually — equivalent to charging 43722 smartphones.
Info::
Green hosting reduces data center emissions

2.91g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 12.3 MB

Your site
2.91g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.60g
End-user device
2.24g
At 10,000 monthly views: Monthly: 29.1 kg · Annual: 349.8 kg · ≈ 43722 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.91g 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

2.91g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 386% more
vs Target 483% 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 (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 GoDaddy✗CDN Cloudflare✓

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 46 KB (vs 12610 KB first visit). 132 of 135 resources are served from browser cache, saving 2.90g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.91g)
First visit
12610 KB
Repeat visit
46 KB

100% reduction on repeat visits

Saving 2.90g CO2 per returning visitor

132 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 1160 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 1160 KB (9% of page weight)

Unused JS 1160 KB

0.27g unnecessary CO2 per visit

Actual transfer 12610 KB
Theoretical minimum 11450 KB
Potential savings 1160 KB (0.27g 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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