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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
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.88g CO2 per view
FIX
0.88g CO2 per view
Info::
0.88g CO2 per page view
This page transfers 3.7 MB, producing an estimated 0.88g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.68g.
Got: 0.88g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 106.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 106.0 kg of CO2 annually — equivalent to charging 13248 smartphones.
Info::
Green hosting reduces data center emissions

0.88g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 42% of websites

Sustainable Web Design model v4 · Page size: 3.7 MB

Your site
0.88g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.18g
End-user device
0.68g
At 10,000 monthly views: Monthly: 8.8 kg · Annual: 106.0 kg · ≈ 13248 smartphone charges
D
Carbon Budget
Action
58th percentile
FIX
58th percentile
Warning::
0.88g CO2 — above the median website (0.60g)
Heavier than an estimated 42% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 58th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.88g

58th percentile

Cleaner than 42% of websites

✗ Above the median website

vs Median 47% more
vs Target 77% 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 102 KB (vs 3821 KB first visit). 116 of 118 resources are served from browser cache, saving 0.86g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.88g)
First visit
3821 KB
Repeat visit
102 KB

97% reduction on repeat visits

Saving 0.86g CO2 per returning visitor

116 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 357 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 357 KB (9% of page weight)

Unused JS 357 KB

0.08g unnecessary CO2 per visit

Actual transfer 3821 KB
Theoretical minimum 3463 KB
Potential savings 357 KB (0.08g 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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