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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
3
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 3 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.37g CO2 per view
FIX
2.37g CO2 per view
Critical::
2.37g CO2 per page view
This page transfers 10.0 MB, producing an estimated 2.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.49g, end-user device 1.82g.
Got: 2.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 283.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 283.9 kg of CO2 annually — equivalent to charging 35482 smartphones.
Info::
Green hosting reduces data center emissions

2.37g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.0 MB

Your site
2.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.49g
End-user device
1.82g
At 10,000 monthly views: Monthly: 23.7 kg · Annual: 283.9 kg · ≈ 35482 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.37g 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

2.37g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 294% more
vs Target 373% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud✓CDN Google Cloud CDN✗

Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017

Google Cloud CDN: Inherits Google Cloud regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

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 17 KB (vs 10234 KB first visit). 61 of 62 resources are served from browser cache, saving 2.36g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.37g)
First visit
10234 KB
Repeat visit
17 KB

100% reduction on repeat visits

Saving 2.36g CO2 per returning visitor

61 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 10234 KB
Theoretical minimum 10234 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
31 images, 740 KB total, 33 KB wasted
INFO

Image Optimization Audit

Total Images

31

Total Size

740 KB

Oversized

3

Wasted

33 KB

9 missing dimensions 20 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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