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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
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.22g CO2 per view
FIX
1.22g CO2 per view
Warning::
1.22g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.22g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.25g, end-user device 0.93g.
Got: 1.22g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 145.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 145.9 kg of CO2 annually — equivalent to charging 18237 smartphones.
Info::
Green hosting reduces data center emissions

1.22g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 33% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.22g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 12.2 kg · Annual: 145.9 kg · ≈ 18237 smartphone charges
D
Carbon Budget
Action
67th percentile
FIX
67th percentile
Warning::
1.22g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.22g

67th percentile

Cleaner than 33% of websites

✗ Above the median website

vs Median 103% more
vs Target 143% more
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 Not identified✗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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 18 KB (vs 5260 KB first visit). 69 of 70 resources are served from browser cache, saving 1.21g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.22g)
First visit
5260 KB
Repeat visit
18 KB

100% reduction on repeat visits

Saving 1.21g CO2 per returning visitor

69 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 25 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 25 KB (0% of page weight)

Unused JS 25 KB

0.01g unnecessary CO2 per visit

Actual transfer 5260 KB
Theoretical minimum 5234 KB
Potential savings 25 KB (0.01g 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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