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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
4.72g CO2 per view
FIX
4.72g CO2 per view
Critical::
4.72g CO2 per page view
This page transfers 19.9 MB, producing an estimated 4.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.98g, end-user device 3.62g.
Got: 4.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 565.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 565.9 kg of CO2 annually — equivalent to charging 70741 smartphones.
Info::
Green hosting reduces data center emissions

4.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 19.9 MB

Your site
4.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.98g
End-user device
3.62g
At 10,000 monthly views: Monthly: 47.2 kg · Annual: 565.9 kg · ≈ 70741 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.72g 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

4.72g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 686% more
vs Target 843% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
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 Not identified✗

Google Cloud: Verified by the Green Web Foundation

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 30 KB (vs 20403 KB first visit). 69 of 70 resources are served from browser cache, saving 4.71g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 4.72g)
First visit
20403 KB
Repeat visit
30 KB

100% reduction on repeat visits

Saving 4.71g CO2 per returning visitor

69 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 256 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 256 KB (1% of page weight)

Unused JS 256 KB

0.06g unnecessary CO2 per visit

Actual transfer 20403 KB
Theoretical minimum 20147 KB
Potential savings 256 KB (0.06g 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: Google Cloud

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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