https://charliekirkface.net
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction1.13g CO2 per viewFIX
CO2 Per Page Load
Action1.13g CO2 per view
1.13g CO2 per view
Warning::
1.13g CO2 per page view
This page transfers 4.8 MB, producing an estimated 1.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.23g, end-user device 0.87g.
Got: 1.13g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 136.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 136.1 kg of CO2 annually — equivalent to charging 17007 smartphones.
Info::
Green hosting reduces data center emissions
1.13g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 35% of websites
Sustainable Web Design model v4 · Page size: 4.8 MB
Your site
1.13g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.23g
End-user device
0.87g
At 10,000 monthly views: Monthly: 11.3 kg · Annual: 136.1 kg · ≈ 17007 smartphone charges
DCarbon BudgetAction65th percentileFIX
Carbon Budget
Action65th percentile
65th percentile
Warning::
1.13g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.13g
65th percentile
Cleaner than 35% of websites
✗ Above the median website
vs Median 89% more
vs Target 127% 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: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 46 KB (vs 4905 KB first visit). 105 of 110 resources are served from browser cache, saving 1.12g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.13g)
First visit
4905 KB
Repeat visit
46 KB
99% reduction on repeat visits
Saving 1.12g CO2 per returning visitor
105 resources served from cache · 5 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 436 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 436 KB (9% of page weight)
Unused JS 436 KB
0.10g unnecessary CO2 per visit
Actual transfer 4905 KB
Theoretical minimum 4468 KB
Potential savings 436 KB (0.10g 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 Optimization39 images, 19416 KB total, 2477 KB wastedINFO
Image Optimization
39 images, 19416 KB total, 2477 KB wasted
Image Optimization Audit
Total Images
39
Total Size
19416 KB
Oversized
3
Wasted
2477 KB
35 missing dimensions 15 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.