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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
74
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
55th percentile
FIX
55th percentile
Warning::
0.79g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.79g

55th percentile

Cleaner than 45% of websites

✗ Above the median website

vs Median 31% more
vs Target 57% more
B
CO2 Per Page Load
0.79g CO2 per view
REVIEW
0.79g CO2 per view
Info::
0.79g CO2 per page view
This page transfers 2.8 MB, producing an estimated 0.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.15g, network 0.14g, end-user device 0.50g.
Got: 0.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 94.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 94.4 kg of CO2 annually — equivalent to charging 11798 smartphones.

0.79g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 45% of websites

Sustainable Web Design model v4 · Page size: 2.8 MB

Your site
0.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.15g
Network
0.14g
End-user device
0.50g
At 10,000 monthly views: Monthly: 7.9 kg · Annual: 94.4 kg · ≈ 11798 smartphone charges
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 51 KB (vs 2844 KB first visit). 105 of 107 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.79g)
First visit
2844 KB
Repeat visit
51 KB

98% reduction on repeat visits

Saving 0.77g CO2 per returning visitor

105 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 258 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 258 KB (9% of page weight)

Unused JS 258 KB

0.07g unnecessary CO2 per visit

Actual transfer 2844 KB
Theoretical minimum 2585 KB
Potential savings 258 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

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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