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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
1.56g CO2 per view
FIX
1.56g CO2 per view
Warning::
1.56g CO2 per page view
This page transfers 6.6 MB, producing an estimated 1.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.32g, end-user device 1.20g.
Got: 1.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 186.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 186.8 kg of CO2 annually — equivalent to charging 23354 smartphones.
Info::
Green hosting reduces data center emissions

1.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 23% of websites

Sustainable Web Design model v4 · Page size: 6.6 MB

Your site
1.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.32g
End-user device
1.20g
At 10,000 monthly views: Monthly: 15.6 kg · Annual: 186.8 kg · ≈ 23354 smartphone charges
F
Carbon Budget
Action
77th percentile
FIX
77th percentile
Warning::
1.56g CO2 — above the median website (0.60g)
Heavier than an estimated 23% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 77th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.56g

77th percentile

Cleaner than 23% of websites

✗ Above the median website

vs Median 159% more
vs Target 211% 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
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 578 KB (vs 6735 KB first visit). 183 of 194 resources are served from browser cache, saving 1.42g CO2 per repeat visit.
Info::
Repeat visit: 0.13g CO2 (first visit: 1.56g)
First visit
6735 KB
Repeat visit
578 KB

91% reduction on repeat visits

Saving 1.42g CO2 per returning visitor

183 resources served from cache · 11 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 222 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 222 KB (3% of page weight)

Unused JS 222 KB

0.05g unnecessary CO2 per visit

Actual transfer 6735 KB
Theoretical minimum 6513 KB
Potential savings 222 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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