Skip to content
https://factcheck.org

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 FIX
D
Carbon Budget
Action
52th percentile
FIX
52th percentile
Warning::
0.69g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.69g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 16% more
vs Target 39% more
B
CO2 Per Page Load
0.69g CO2 per view
REVIEW
0.69g CO2 per view
Info::
0.69g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.53g.
Got: 0.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 83.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 83.4 kg of CO2 annually — equivalent to charging 10419 smartphones.
Info::
Green hosting reduces data center emissions

0.69g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.9 MB

Your site
0.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.14g
End-user device
0.53g
At 10,000 monthly views: Monthly: 6.9 kg · Annual: 83.4 kg · ≈ 10419 smartphone charges
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Apache HTTP Server✓CDN Google Cloud CDN✗

Apache HTTP Server: Verified by the Green Web Foundation

Google Cloud CDN: Inherits Google Cloud regional renewable mix

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 14 KB (vs 3005 KB first visit). 58 of 59 resources are served from browser cache, saving 0.69g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.69g)
First visit
3005 KB
Repeat visit
14 KB

100% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

58 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 214 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 214 KB (7% of page weight)

Unused JS 214 KB

0.05g unnecessary CO2 per visit

Actual transfer 3005 KB
Theoretical minimum 2790 KB
Potential savings 214 KB (0.05g 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: Google Cloud

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback