https://interestingengineering.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
FCO2 Per Page LoadAction4.42g CO2 per viewFIX
CO2 Per Page Load
Action4.42g CO2 per view
4.42g CO2 per view
Critical::
4.42g CO2 per page view
This page transfers 18.7 MB, producing an estimated 4.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.91g, end-user device 3.39g.
Got: 4.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 530.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 530.1 kg of CO2 annually — equivalent to charging 66256 smartphones.
Info::
Green hosting reduces data center emissions
4.42g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 18.7 MB
Your site
4.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.11g
Network
0.91g
End-user device
3.39g
At 10,000 monthly views: Monthly: 44.2 kg · Annual: 530.1 kg · ≈ 66256 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
4.42g 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
4.42g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 636% more
vs Target 783% 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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 89 KB (vs 19110 KB first visit). 196 of 197 resources are served from browser cache, saving 4.40g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 4.42g)
First visit
19110 KB
Repeat visit
89 KB
100% reduction on repeat visits
Saving 4.40g CO2 per returning visitor
196 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 789 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 789 KB (4% of page weight)
Unused JS 789 KB
0.18g unnecessary CO2 per visit
Actual transfer 19110 KB
Theoretical minimum 18321 KB
Potential savings 789 KB (0.18g 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.