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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
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
9.67g CO2 per view
FIX
9.67g CO2 per view
Critical::
9.67g CO2 per page view
This page transfers 40.9 MB, producing an estimated 9.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 2.00g, end-user device 7.43g.
Got: 9.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1160.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1160.9 kg of CO2 annually — equivalent to charging 145112 smartphones.
Info::
Green hosting reduces data center emissions

9.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 40.9 MB

Your site
9.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
2.00g
End-user device
7.43g
At 10,000 monthly views: Monthly: 96.7 kg · Annual: 1160.9 kg · ≈ 145112 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
9.67g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

9.67g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1512% more
vs Target 1835% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓

Next.js: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 48 KB (vs 41853 KB first visit). 78 of 79 resources are served from browser cache, saving 9.66g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 9.67g)
First visit
41853 KB
Repeat visit
48 KB

100% reduction on repeat visits

Saving 9.66g CO2 per returning visitor

78 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 533 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 533 KB (1% of page weight)

Unused JS 533 KB

0.12g unnecessary CO2 per visit

Actual transfer 41853 KB
Theoretical minimum 41320 KB
Potential savings 533 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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