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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
3.57g CO2 per view
FIX
3.57g CO2 per view
Critical::
3.57g CO2 per page view
This page transfers 15.1 MB, producing an estimated 3.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.74g, end-user device 2.74g.
Got: 3.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 428.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 428.8 kg of CO2 annually — equivalent to charging 53603 smartphones.
Info::
Green hosting reduces data center emissions

3.57g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 15.1 MB

Your site
3.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.74g
End-user device
2.74g
At 10,000 monthly views: Monthly: 35.7 kg · Annual: 428.8 kg · ≈ 53603 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.57g 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

3.57g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 496% more
vs Target 615% 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 58 KB (vs 15460 KB first visit). 204 of 210 resources are served from browser cache, saving 3.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.57g)
First visit
15460 KB
Repeat visit
58 KB

100% reduction on repeat visits

Saving 3.56g CO2 per returning visitor

204 resources served from cache · 6 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 1047 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 1047 KB (7% of page weight)

Unused JS 1047 KB

0.24g unnecessary CO2 per visit

Actual transfer 15460 KB
Theoretical minimum 14413 KB
Potential savings 1047 KB (0.24g 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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