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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
54
GRADE
F
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
15.30g CO2 per view
FIX
15.30g CO2 per view
Critical::
15.30g CO2 per page view
This page transfers 54.0 MB, producing an estimated 15.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 2.83g, network 2.64g, end-user device 9.82g.
Got: 15.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1836.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1836.1 kg of CO2 annually — equivalent to charging 229507 smartphones.

15.30g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 54.0 MB

Your site
15.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
2.83g
Network
2.64g
End-user device
9.82g
At 10,000 monthly views: Monthly: 153.0 kg · Annual: 1836.1 kg · ≈ 229507 smartphone charges
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 Snowplow Analytics✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
15.30g 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

15.30g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 2450% more
vs Target 2960% more
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 599 KB (vs 55324 KB first visit). 1720 of 1917 resources are served from browser cache, saving 15.13g CO2 per repeat visit.
Info::
Repeat visit: 0.17g CO2 (first visit: 15.30g)
First visit
55324 KB
Repeat visit
599 KB

99% reduction on repeat visits

Saving 15.13g CO2 per returning visitor

1720 resources served from cache · 197 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 2871 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 2871 KB (5% of page weight)

Unused JS 2871 KB

0.79g unnecessary CO2 per visit

Actual transfer 55324 KB
Theoretical minimum 52452 KB
Potential savings 2871 KB (0.79g 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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