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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
77
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.98g CO2 per view
FIX
0.98g CO2 per view
Info::
0.98g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.75g.
Got: 0.98g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 117.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 117.1 kg of CO2 annually — equivalent to charging 14635 smartphones.
Info::
Green hosting reduces data center emissions

0.98g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
0.98g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.20g
End-user device
0.75g
At 10,000 monthly views: Monthly: 9.8 kg · Annual: 117.1 kg · ≈ 14635 smartphone charges
D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.98g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.98g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 63% more
vs Target 95% more
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 653 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 653 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
85% efficient

Total waste: 653 KB (15% of page weight)

Unused JS 653 KB

0.15g unnecessary CO2 per visit

Actual transfer 4221 KB
Theoretical minimum 3567 KB
Potential savings 653 KB (0.15g 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 55 KB (vs 4221 KB first visit). 166 of 168 resources are served from browser cache, saving 0.96g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.98g)
First visit
4221 KB
Repeat visit
55 KB

99% reduction on repeat visits

Saving 0.96g CO2 per returning visitor

166 resources served from cache · 2 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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