https://wur.nl
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction3.71g CO2 per viewFIX
CO2 Per Page Load
Action3.71g CO2 per view
3.71g CO2 per view
Critical::
3.71g CO2 per page view
This page transfers 15.7 MB, producing an estimated 3.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.77g, end-user device 2.85g.
Got: 3.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 445.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 445.3 kg of CO2 annually — equivalent to charging 55666 smartphones.
Info::
Green hosting reduces data center emissions
3.71g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 15.7 MB
Your site
3.71g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.09g
Network
0.77g
End-user device
2.85g
At 10,000 monthly views: Monthly: 37.1 kg · Annual: 445.3 kg · ≈ 55666 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.71g 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
3.71g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 519% more
vs Target 642% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: 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 Apache HTTP Server✓CDN Not identified✗
Apache HTTP Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 54 KB (vs 16055 KB first visit). 120 of 122 resources are served from browser cache, saving 3.70g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.71g)
First visit
16055 KB
Repeat visit
54 KB
100% reduction on repeat visits
Saving 3.70g CO2 per returning visitor
120 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 405 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 405 KB (3% of page weight)
Unused JS 405 KB
0.09g unnecessary CO2 per visit
Actual transfer 16055 KB
Theoretical minimum 15649 KB
Potential savings 405 KB (0.09g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Combell
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.