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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
60
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.58g CO2 per view
FIX
1.58g CO2 per view
Warning::
1.58g CO2 per page view
This page transfers 6.7 MB, producing an estimated 1.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.21g.
Got: 1.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 189.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 189.1 kg of CO2 annually — equivalent to charging 23631 smartphones.
Info::
Green hosting reduces data center emissions

1.58g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 23% of websites

Sustainable Web Design model v4 · Page size: 6.7 MB

Your site
1.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.33g
End-user device
1.21g
At 10,000 monthly views: Monthly: 15.8 kg · Annual: 189.1 kg · ≈ 23631 smartphone charges
F
Carbon Budget
Action
77th percentile
FIX
77th percentile
Warning::
1.58g 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

1.58g

77th percentile

Cleaner than 23% of websites

✗ Above the median website

vs Median 163% more
vs Target 215% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: 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 Apache HTTP Server✓CDN Not identified✗

Apache HTTP Server: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
67% efficient
REVIEW
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 2238 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2238 KB of unused JavaScript. This wasted data produces 0.52g of unnecessary CO2 per page view.
67% efficient

Total waste: 2238 KB (33% of page weight)

Unused JS 2238 KB

0.52g unnecessary CO2 per visit

Actual transfer 6816 KB
Theoretical minimum 4577 KB
Potential savings 2238 KB (0.52g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 42 KB (vs 6816 KB first visit). 117 of 118 resources are served from browser cache, saving 1.57g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.58g)
First visit
6816 KB
Repeat visit
42 KB

99% reduction on repeat visits

Saving 1.57g CO2 per returning visitor

117 resources served from cache · 1 resources re-downloaded

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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