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Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
58
GRADE
D
FIX
4
REVIEW
2
PASS
1
INFO
1
Checks
81 PASS 2 REVIEW 4 FIX
DCO2 Per Page LoadAction0.83g CO2 per viewFIX
CO2 Per Page Load
Action0.83g CO2 per view
0.83g CO2 per view
Info::
0.83g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.83g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.15g, network 0.14g, end-user device 0.53g.
Got: 0.83g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 99.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 99.4 kg of CO2 annually — equivalent to charging 12429 smartphones.
0.83g
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
0.83g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.15g
Network
0.14g
End-user device
0.53g
At 10,000 monthly views: Monthly: 8.3 kg · Annual: 99.4 kg · ≈ 12429 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::
0.83g 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
0.83g
56th percentile
Cleaner than 44% of websites
✗ Above the median website
vs Median 38% more
vs Target 66% more
FTransfer EfficiencyAction39% efficientFIX
Transfer Efficiency
Action39% efficient
39% efficient
Critical::
Transfer efficiency: 39%
An estimated 1835 KB (61%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1835 KB of unused JavaScript. This wasted data produces 0.51g of unnecessary CO2 per page view.
Total waste: 1835 KB (61% of page weight)
Unused JS 1835 KB
0.51g unnecessary CO2 per visit
Actual transfer 2996 KB
Theoretical minimum 1160 KB
Potential savings 1835 KB (0.51g 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 98 KB (vs 2996 KB first visit). 122 of 129 resources are served from browser cache, saving 0.80g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.83g)
First visit
2996 KB
Repeat visit
98 KB
97% reduction on repeat visits
Saving 0.80g CO2 per returning visitor
122 resources served from cache · 7 resources re-downloaded
Image Optimization7 images, 0 KB total, 0 KB wastedINFO
Image Optimization
7 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
7
Total Size
0 KB
Oversized
1
5 missing dimensions 3 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.