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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
4.92g CO2 per view
FIX
4.92g CO2 per view
Critical::
4.92g CO2 per page view
This page transfers 20.8 MB, producing an estimated 4.92g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 1.02g, end-user device 3.78g.
Got: 4.92g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 590.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 590.2 kg of CO2 annually — equivalent to charging 73774 smartphones.
Info::
Green hosting reduces data center emissions

4.92g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 20.8 MB

Your site
4.92g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
1.02g
End-user device
3.78g
At 10,000 monthly views: Monthly: 49.2 kg · Annual: 590.2 kg · ≈ 73774 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.92g 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

4.92g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 720% more
vs Target 884% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Express, CDN: Cloudflare
Info::
Express: 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 Express✓CDN Cloudflare✓

Express: 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 96 KB (vs 21278 KB first visit). 137 of 140 resources are served from browser cache, saving 4.90g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 4.92g)
First visit
21278 KB
Repeat visit
96 KB

100% reduction on repeat visits

Saving 4.90g CO2 per returning visitor

137 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 638 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 638 KB (3% of page weight)

Unused JS 638 KB

0.15g unnecessary CO2 per visit

Actual transfer 21278 KB
Theoretical minimum 20639 KB
Potential savings 638 KB (0.15g 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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