https://unwto.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
FCO2 Per Page LoadAction1.95g CO2 per viewFIX
CO2 Per Page Load
Action1.95g CO2 per view
1.95g CO2 per view
Warning::
1.95g CO2 per page view
This page transfers 8.2 MB, producing an estimated 1.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.40g, end-user device 1.50g.
Got: 1.95g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 233.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 233.7 kg of CO2 annually — equivalent to charging 29208 smartphones.
Info::
Green hosting reduces data center emissions
1.95g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 12% of websites
Sustainable Web Design model v4 · Page size: 8.2 MB
Your site
1.95g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.40g
End-user device
1.50g
At 10,000 monthly views: Monthly: 19.5 kg · Annual: 233.7 kg · ≈ 29208 smartphone charges
FCarbon BudgetAction88th percentileFIX
Carbon Budget
Action88th percentile
88th percentile
Warning::
1.95g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.95g
88th percentile
Cleaner than 12% of websites
✗ Above the median website
vs Median 225% more
vs Target 289% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓
Amazon Web Services: 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 269 KB (vs 8424 KB first visit). 155 of 157 resources are served from browser cache, saving 1.88g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.95g)
First visit
8424 KB
Repeat visit
269 KB
97% reduction on repeat visits
Saving 1.88g CO2 per returning visitor
155 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 110 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 110 KB (1% of page weight)
Unused JS 110 KB
0.03g unnecessary CO2 per visit
Actual transfer 8424 KB
Theoretical minimum 8313 KB
Potential savings 110 KB (0.03g 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: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.