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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
64
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.75g CO2 per view
FIX
1.75g CO2 per view
Warning::
1.75g CO2 per page view
This page transfers 7.4 MB, producing an estimated 1.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.36g, end-user device 1.35g.
Got: 1.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 210.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 210.3 kg of CO2 annually — equivalent to charging 26286 smartphones.
Info::
Green hosting reduces data center emissions

1.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site
1.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.36g
End-user device
1.35g
At 10,000 monthly views: Monthly: 17.5 kg · Annual: 210.3 kg · ≈ 26286 smartphone charges
F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.75g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.75g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 192% more
vs Target 250% 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

B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 1236 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1236 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.
84% efficient

Total waste: 1236 KB (16% of page weight)

Unused JS 1236 KB

0.29g unnecessary CO2 per visit

Actual transfer 7581 KB
Theoretical minimum 6345 KB
Potential savings 1236 KB (0.29g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 428 KB (vs 7581 KB first visit). 166 of 167 resources are served from browser cache, saving 1.65g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.75g)
First visit
7581 KB
Repeat visit
428 KB

94% reduction on repeat visits

Saving 1.65g CO2 per returning visitor

166 resources served from cache · 1 resources re-downloaded

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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