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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
1.75g CO2 per view
FIX
1.75g CO2 per view
Warning::
1.75g CO2 per page view
This page transfers 7.4 MB, producing an estimated 1.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.36g, end-user device 1.34g.
Got: 1.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 209.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 209.8 kg of CO2 annually — equivalent to charging 26222 smartphones.
Info::
Green hosting reduces data center emissions

1.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site
1.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.36g
End-user device
1.34g
At 10,000 monthly views: Monthly: 17.5 kg · Annual: 209.8 kg · ≈ 26222 smartphone charges
F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.75g 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

1.75g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 191% more
vs Target 250% more
B
Transfer Efficiency
81% efficient
REVIEW
81% efficient
Info::
Transfer efficiency: 81%
An estimated 1474 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1474 KB of unused JavaScript. This wasted data produces 0.34g of unnecessary CO2 per page view.
81% efficient

Total waste: 1474 KB (19% of page weight)

Unused JS 1474 KB

0.34g unnecessary CO2 per visit

Actual transfer 7563 KB
Theoretical minimum 6088 KB
Potential savings 1474 KB (0.34g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 64 KB (vs 7563 KB first visit). 200 of 206 resources are served from browser cache, saving 1.73g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.75g)
First visit
7563 KB
Repeat visit
64 KB

99% reduction on repeat visits

Saving 1.73g CO2 per returning visitor

200 resources served from cache · 6 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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