https://loremipsum.io
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
65
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction0.81g CO2 per viewFIX
CO2 Per Page Load
Action0.81g CO2 per view
0.81g CO2 per view
Info::
0.81g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.81g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.15g, network 0.14g, end-user device 0.52g.
Got: 0.81g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 97.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 97.8 kg of CO2 annually — equivalent to charging 12222 smartphones.
0.81g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 44% of websites
Sustainable Web Design model v4 · Page size: 2.9 MB
Your site
0.81g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.15g
Network
0.14g
End-user device
0.52g
At 10,000 monthly views: Monthly: 8.1 kg · Annual: 97.8 kg · ≈ 12222 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting AWS✗CDN AWS CloudFront✗
AWS: Renewable energy varies by region; committed to 100% by 2025
AWS CloudFront: Renewable varies by edge location
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction56th percentileFIX
Carbon Budget
Action56th percentile
56th percentile
Warning::
0.81g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.81g
56th percentile
Cleaner than 44% of websites
✗ Above the median website
vs Median 36% more
vs Target 63% more
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 744 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 744 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
Total waste: 744 KB (25% of page weight)
Unused JS 744 KB
0.21g unnecessary CO2 per visit
Actual transfer 2946 KB
Theoretical minimum 2202 KB
Potential savings 744 KB (0.21g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 147 KB (vs 2946 KB first visit). 60 of 62 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.81g)
First visit
2946 KB
Repeat visit
147 KB
95% reduction on repeat visits
Saving 0.77g CO2 per returning visitor
60 resources served from cache · 2 resources re-downloaded
Image Optimization9 images, 11 KB total, 0 KB wastedINFO
Image Optimization
9 images, 11 KB total, 0 KB wasted
Image Optimization Audit
Total Images
9
Total Size
11 KB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.