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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
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
10.94g CO2 per view
FIX
10.94g CO2 per view
Critical::
10.94g CO2 per page view
This page transfers 46.2 MB, producing an estimated 10.94g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 2.26g, end-user device 8.40g.
Got: 10.94g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1312.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1312.7 kg of CO2 annually — equivalent to charging 164091 smartphones.
Info::
Green hosting reduces data center emissions

10.94g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 46.2 MB

Your site
10.94g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
2.26g
End-user device
8.40g
At 10,000 monthly views: Monthly: 109.4 kg · Annual: 1312.7 kg · ≈ 164091 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
10.94g 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

10.94g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1723% more
vs Target 2088% 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::
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 Apache HTTP Server✓CDN Google Cloud CDN✗

Apache HTTP Server: 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 122 KB (vs 47328 KB first visit). 267 of 275 resources are served from browser cache, saving 10.91g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 10.94g)
First visit
47328 KB
Repeat visit
122 KB

100% reduction on repeat visits

Saving 10.91g CO2 per returning visitor

267 resources served from cache · 8 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 2491 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 2491 KB (5% of page weight)

Unused JS 2491 KB

0.58g unnecessary CO2 per visit

Actual transfer 47328 KB
Theoretical minimum 44836 KB
Potential savings 2491 KB (0.58g 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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