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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
2.01g CO2 per view
FIX
2.01g CO2 per view
Critical::
2.01g CO2 per page view
This page transfers 8.5 MB, producing an estimated 2.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.54g.
Got: 2.01g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 241.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 241.2 kg of CO2 annually — equivalent to charging 30149 smartphones.
Info::
Green hosting reduces data center emissions

2.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site
2.01g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.42g
End-user device
1.54g
At 10,000 monthly views: Monthly: 20.1 kg · Annual: 241.2 kg · ≈ 30149 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.01g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.01g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 235% more
vs Target 302% 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 357 KB (vs 8695 KB first visit). 146 of 153 resources are served from browser cache, saving 1.93g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 2.01g)
First visit
8695 KB
Repeat visit
357 KB

96% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

146 resources served from cache · 7 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 223 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 223 KB (3% of page weight)

Unused JS 223 KB

0.05g unnecessary CO2 per visit

Actual transfer 8695 KB
Theoretical minimum 8472 KB
Potential savings 223 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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