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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
7
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
4.88g CO2 per view
FIX
4.88g CO2 per view
Critical::
4.88g CO2 per page view
This page transfers 20.6 MB, producing an estimated 4.88g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 1.01g, end-user device 3.75g.
Got: 4.88g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 585.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 585.9 kg of CO2 annually — equivalent to charging 73232 smartphones.
Info::
Green hosting reduces data center emissions

4.88g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 20.6 MB

Your site
4.88g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
1.01g
End-user device
3.75g
At 10,000 monthly views: Monthly: 48.8 kg · Annual: 585.9 kg · ≈ 73232 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.88g 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

4.88g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 714% more
vs Target 876% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Freethought Internet uses renewable energy
Info::
Freethought Internet: Verified by the Green Web Foundation
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 Freethought Internet✓CDN Not identified✗

Freethought Internet: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Web Font Weight Variants
Action
19 font weights loaded across 2 famil(y/ies)
REVIEW
19 font weights loaded across 2 famil(y/ies)
Warning::
19 font weights loaded -- likely 100+ KB of unused payload
Loading 19 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Open Sans%3A400%2C600%2C700%2C800, Poppins.
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 123 KB (vs 21121 KB first visit). 182 of 186 resources are served from browser cache, saving 4.85g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 4.88g)
First visit
21121 KB
Repeat visit
123 KB

99% reduction on repeat visits

Saving 4.85g CO2 per returning visitor

182 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 1325 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 1325 KB (6% of page weight)

Unused JS 1325 KB

0.31g unnecessary CO2 per visit

Actual transfer 21121 KB
Theoretical minimum 19796 KB
Potential savings 1325 KB (0.31g 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: Freethought Internet

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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