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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
65
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.71g CO2 per view
FIX
1.71g CO2 per view
Warning::
1.71g CO2 per page view
This page transfers 7.2 MB, producing an estimated 1.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.35g, end-user device 1.31g.
Got: 1.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 205.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 205.1 kg of CO2 annually — equivalent to charging 25636 smartphones.
Info::
Green hosting reduces data center emissions

1.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 19% of websites

Sustainable Web Design model v4 · Page size: 7.2 MB

Your site
1.71g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.35g
End-user device
1.31g
At 10,000 monthly views: Monthly: 17.1 kg · Annual: 205.1 kg · ≈ 25636 smartphone charges
F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.71g CO2 — above the median website (0.60g)
Heavier than an estimated 19% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 81th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.71g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 185% more
vs Target 242% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 837 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 837 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
89% efficient

Total waste: 837 KB (11% of page weight)

Unused JS 837 KB

0.19g unnecessary CO2 per visit

Actual transfer 7394 KB
Theoretical minimum 6556 KB
Potential savings 837 KB (0.19g 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
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
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 Hosting✓ Green Hosted
Hosting Next.js✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 111 KB (vs 7394 KB first visit). 135 of 136 resources are served from browser cache, saving 1.68g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.71g)
First visit
7394 KB
Repeat visit
111 KB

98% reduction on repeat visits

Saving 1.68g CO2 per returning visitor

135 resources served from cache · 1 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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