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https://sitepoint.com

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
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.99g CO2 per view
FIX
1.99g CO2 per view
Warning::
1.99g CO2 per page view
This page transfers 7.0 MB, producing an estimated 1.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.34g, end-user device 1.28g.
Got: 1.99g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 239.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 239.3 kg of CO2 annually — equivalent to charging 29918 smartphones.

1.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 7.0 MB

Your site
1.99g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.37g
Network
0.34g
End-user device
1.28g
At 10,000 monthly views: Monthly: 19.9 kg · Annual: 239.3 kg · ≈ 29918 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 Next.js✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
89th percentile
FIX
89th percentile
Warning::
1.99g CO2 — above the median website (0.60g)
Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 89th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.99g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 232% more
vs Target 299% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 26 KB (vs 7211 KB first visit). 103 of 104 resources are served from browser cache, saving 1.99g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.99g)
First visit
7211 KB
Repeat visit
26 KB

100% reduction on repeat visits

Saving 1.99g CO2 per returning visitor

103 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 565 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 565 KB (8% of page weight)

Unused JS 565 KB

0.16g unnecessary CO2 per visit

Actual transfer 7211 KB
Theoretical minimum 6646 KB
Potential savings 565 KB (0.16g 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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