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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
68
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
1.79g CO2 per view
FIX
1.79g CO2 per view
Warning::
1.79g CO2 per page view
This page transfers 7.6 MB, producing an estimated 1.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.37g, end-user device 1.37g.
Got: 1.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 214.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 214.8 kg of CO2 annually — equivalent to charging 26843 smartphones.
Info::
Green hosting reduces data center emissions

1.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 17% of websites

Sustainable Web Design model v4 · Page size: 7.6 MB

Your site
1.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.37g
End-user device
1.37g
At 10,000 monthly views: Monthly: 17.9 kg · Annual: 214.8 kg · ≈ 26843 smartphone charges
F
Carbon Budget
Action
83th percentile
FIX
83th percentile
Warning::
1.79g CO2 — above the median website (0.60g)
Heavier than an estimated 17% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 83th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.79g

83rd percentile

Cleaner than 17% of websites

✗ Above the median website

vs Median 198% more
vs Target 258% 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::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud CDN✗

Google Cloud: Verified by the Green Web Foundation

Google Cloud CDN: Inherits Google Cloud regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 188 KB (vs 7742 KB first visit). 265 of 267 resources are served from browser cache, saving 1.75g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.79g)
First visit
7742 KB
Repeat visit
188 KB

98% reduction on repeat visits

Saving 1.75g CO2 per returning visitor

265 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 214 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 214 KB (3% of page weight)

Unused JS 214 KB

0.05g unnecessary CO2 per visit

Actual transfer 7742 KB
Theoretical minimum 7527 KB
Potential savings 214 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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