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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
72
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
1.38g CO2 per view
FIX
1.38g CO2 per view
Warning::
1.38g CO2 per page view
This page transfers 5.8 MB, producing an estimated 1.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.29g, end-user device 1.06g.
Got: 1.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 166.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 166.0 kg of CO2 annually — equivalent to charging 20753 smartphones.
Info::
Green hosting reduces data center emissions

1.38g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 28% of websites

Sustainable Web Design model v4 · Page size: 5.8 MB

Your site
1.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.29g
End-user device
1.06g
At 10,000 monthly views: Monthly: 13.8 kg · Annual: 166.0 kg · ≈ 20753 smartphone charges
F
Carbon Budget
Action
72th percentile
FIX
72th percentile
Warning::
1.38g CO2 — above the median website (0.60g)
Heavier than an estimated 28% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 72th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.38g

72nd percentile

Cleaner than 28% of websites

✗ Above the median website

vs Median 131% more
vs Target 177% 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 310 KB (vs 5985 KB first visit). 127 of 138 resources are served from browser cache, saving 1.31g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.38g)
First visit
5985 KB
Repeat visit
310 KB

95% reduction on repeat visits

Saving 1.31g CO2 per returning visitor

127 resources served from cache · 11 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 227 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 227 KB (4% of page weight)

Unused JS 227 KB

0.05g unnecessary CO2 per visit

Actual transfer 5985 KB
Theoretical minimum 5758 KB
Potential savings 227 KB (0.05g 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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