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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
76
GRADE
C
FIX
0
REVIEW
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 4 REVIEW
B
CO2 Per Page Load
0.59g CO2 per view
REVIEW
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.45g.
Got: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 70.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 70.4 kg of CO2 annually — equivalent to charging 8796 smartphones.
Info::
Green hosting reduces data center emissions

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 52% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 5.9 kg · Annual: 70.4 kg · ≈ 8796 smartphone charges
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
Carbon Budget
48th percentile
REVIEW
48th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 52% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 48th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.59g

48th percentile

Cleaner than 52% of websites

✗ Above the median website

vs Median 2% cleaner ✓
vs Target 17% more
C
Transfer Efficiency
Action
73% efficient
REVIEW
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 689 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 689 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
73% efficient

Total waste: 689 KB (27% of page weight)

Unused JS 689 KB

0.16g unnecessary CO2 per visit

Actual transfer 2537 KB
Theoretical minimum 1847 KB
Potential savings 689 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 192 KB (vs 2537 KB first visit). 87 of 90 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.59g)
First visit
2537 KB
Repeat visit
192 KB

92% reduction on repeat visits

Saving 0.54g CO2 per returning visitor

87 resources served from cache · 3 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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