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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
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗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 32% more
vs Target 58% 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 0.51g.
Got: 0.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 95.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 95.1 kg of CO2 annually — equivalent to charging 11881 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
0.51g
At 10,000 monthly views: Monthly: 7.9 kg · Annual: 95.1 kg · ≈ 11881 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 36 KB (vs 2864 KB first visit). 165 of 166 resources are served from browser cache, saving 0.78g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.79g)
First visit
2864 KB
Repeat visit
36 KB

99% reduction on repeat visits

Saving 0.78g CO2 per returning visitor

165 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 104 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 104 KB (4% of page weight)

Unused JS 104 KB

0.03g unnecessary CO2 per visit

Actual transfer 2864 KB
Theoretical minimum 2759 KB
Potential savings 104 KB (0.03g 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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