https://emmanuel-alade-websi-5h0d.bolt.host
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
90
GRADE
A
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction1.31g CO2 per viewFIX
CO2 Per Page Load
Action1.31g CO2 per view
1.31g CO2 per view
Warning::
1.31g CO2 per page view
This page transfers 5.5 MB, producing an estimated 1.31g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.27g, end-user device 1.01g.
Got: 1.31g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 157.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 157.6 kg of CO2 annually — equivalent to charging 19694 smartphones.
Info::
Green hosting reduces data center emissions
1.31g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 30% of websites
Sustainable Web Design model v4 · Page size: 5.5 MB
Your site
1.31g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.27g
End-user device
1.01g
At 10,000 monthly views: Monthly: 13.1 kg · Annual: 157.6 kg · ≈ 19694 smartphone charges
DCarbon BudgetAction70th percentileFIX
Carbon Budget
Action70th percentile
70th percentile
Warning::
1.31g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.31g
70th percentile
Cleaner than 30% of websites
✗ Above the median website
vs Median 119% more
vs Target 163% more
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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 1 KB (vs 5680 KB first visit). 14 of 15 resources are served from browser cache, saving 1.31g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.31g)
First visit
5680 KB
Repeat visit
1 KB
100% reduction on repeat visits
Saving 1.31g CO2 per returning visitor
14 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 57 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 57 KB (1% of page weight)
Unused JS 57 KB
0.01g unnecessary CO2 per visit
Actual transfer 5680 KB
Theoretical minimum 5623 KB
Potential savings 57 KB (0.01g 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
Image Optimization7 images, 2453 KB total, 927 KB wastedINFO
Image Optimization
7 images, 2453 KB total, 927 KB wasted
Image Optimization Audit
Total Images
7
Total Size
2453 KB
Oversized
1
Wasted
927 KB
7 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.