https://parceltheory.ca
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
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction0.96g CO2 per viewFIX
CO2 Per Page Load
Action0.96g CO2 per view
0.96g CO2 per view
Info::
0.96g CO2 per page view
This page transfers 4.0 MB, producing an estimated 0.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.73g.
Got: 0.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 114.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 114.7 kg of CO2 annually — equivalent to charging 14337 smartphones.
Info::
Green hosting reduces data center emissions
0.96g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 40% of websites
Sustainable Web Design model v4 · Page size: 4.0 MB
Your site
0.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.20g
End-user device
0.73g
At 10,000 monthly views: Monthly: 9.6 kg · Annual: 114.7 kg · ≈ 14337 smartphone charges
DCarbon BudgetAction60th percentileFIX
Carbon Budget
Action60th percentile
60th percentile
Warning::
0.96g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.96g
60th percentile
Cleaner than 40% of websites
✗ Above the median website
vs Median 59% more
vs Target 91% more
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 534 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 534 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
Total waste: 534 KB (13% of page weight)
Unused JS 534 KB
0.12g unnecessary CO2 per visit
Actual transfer 4135 KB
Theoretical minimum 3601 KB
Potential savings 534 KB (0.12g 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.
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 Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 159 KB (vs 4135 KB first visit). 498 of 506 resources are served from browser cache, saving 0.92g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.96g)
First visit
4135 KB
Repeat visit
159 KB
96% reduction on repeat visits
Saving 0.92g CO2 per returning visitor
498 resources served from cache · 8 resources re-downloaded
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 Optimization57 images, 990 KB total, 0 KB wastedINFO
Image Optimization
57 images, 990 KB total, 0 KB wasted
Image Optimization Audit
Total Images
57
Total Size
990 KB
1 missing alt text 1 missing dimensions 11 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.