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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.74g CO2 per view
FIX
1.74g CO2 per view
Warning::
1.74g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.74g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.11g.
Got: 1.74g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 208.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 208.3 kg of CO2 annually — equivalent to charging 26035 smartphones.

1.74g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.1 MB

Your site
1.74g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.11g
At 10,000 monthly views: Monthly: 17.4 kg · Annual: 208.3 kg · ≈ 26035 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
82th percentile
FIX
82th percentile
Warning::
1.74g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.74g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 189% more
vs Target 247% more
B
Transfer Efficiency
79% efficient
REVIEW
79% efficient
Info::
Transfer efficiency: 79%
An estimated 1327 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1327 KB of unused JavaScript. This wasted data produces 0.37g of unnecessary CO2 per page view.
79% efficient

Total waste: 1327 KB (21% of page weight)

Unused JS 1327 KB

0.37g unnecessary CO2 per visit

Actual transfer 6275 KB
Theoretical minimum 4948 KB
Potential savings 1327 KB (0.37g CO2)

See Deep Analysis sections above for specific optimizations.

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 141 KB (vs 6275 KB first visit). 228 of 235 resources are served from browser cache, saving 1.70g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.74g)
First visit
6275 KB
Repeat visit
141 KB

98% reduction on repeat visits

Saving 1.70g CO2 per returning visitor

228 resources served from cache · 7 resources re-downloaded

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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