https://uu.se
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
0
REVIEW
3
PASS
3
INFO
0
Checks
63 PASS 3 REVIEW
BCO2 Per Page Load0.57g CO2 per viewREVIEW
CO2 Per Page Load
0.57g CO2 per view
0.57g CO2 per view
Info::
0.57g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.44g.
Got: 0.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 68.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 68.3 kg of CO2 annually — equivalent to charging 8536 smartphones.
Info::
Green hosting reduces data center emissions
0.57g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 54% of websites
Sustainable Web Design model v4 · Page size: 2.4 MB
Your site
0.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.44g
At 10,000 monthly views: Monthly: 5.7 kg · Annual: 68.3 kg · ≈ 8536 smartphone charges
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Sitevision AB uses renewable energy
Info::
Sitevision AB: 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 Sitevision AB✓CDN Not identified✗
Sitevision AB: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget46th percentileREVIEW
Carbon Budget
46th percentile
46th percentile
Info::
0.57g CO2 — below the median website (0.60g)
Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 46th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.57g
46th percentile
Cleaner than 54% of websites
✗ Above the median website
vs Median 5% cleaner ✓
vs Target 14% more
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 41 KB (vs 2462 KB first visit). 172 of 173 resources are served from browser cache, saving 0.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.57g)
First visit
2462 KB
Repeat visit
41 KB
98% reduction on repeat visits
Saving 0.56g CO2 per returning visitor
172 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 155 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 155 KB (6% of page weight)
Unused JS 155 KB
0.04g unnecessary CO2 per visit
Actual transfer 2462 KB
Theoretical minimum 2306 KB
Potential savings 155 KB (0.04g 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: Sitevision AB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.