https://www.mbda-systems.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.35g CO2 per viewFIX
CO2 Per Page Load
Action1.35g CO2 per view
1.35g CO2 per view
Warning::
1.35g CO2 per page view
This page transfers 5.7 MB, producing an estimated 1.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.28g, end-user device 1.04g.
Got: 1.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 162.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 162.0 kg of CO2 annually — equivalent to charging 20253 smartphones.
Info::
Green hosting reduces data center emissions
1.35g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 29% of websites
Sustainable Web Design model v4 · Page size: 5.7 MB
Your site
1.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.28g
End-user device
1.04g
At 10,000 monthly views: Monthly: 13.5 kg · Annual: 162.0 kg · ≈ 20253 smartphone charges
FCarbon BudgetAction71th percentileFIX
Carbon Budget
Action71th percentile
71th percentile
Warning::
1.35g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.35g
71st percentile
Cleaner than 29% of websites
✗ Above the median website
vs Median 125% more
vs Target 170% 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.
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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight90% cachedPASS
Repeat Visit Weight
90% cached
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 562 KB (vs 5841 KB first visit). 101 of 102 resources are served from browser cache, saving 1.22g CO2 per repeat visit.
Info::
Repeat visit: 0.13g CO2 (first visit: 1.35g)
First visit
5841 KB
Repeat visit
562 KB
90% reduction on repeat visits
Saving 1.22g CO2 per returning visitor
101 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 545 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 545 KB (9% of page weight)
Unused JS 545 KB
0.13g unnecessary CO2 per visit
Actual transfer 5841 KB
Theoretical minimum 5295 KB
Potential savings 545 KB (0.13g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization72 images, 1131 KB total, 184 KB wastedINFO
Image Optimization
72 images, 1131 KB total, 184 KB wasted
Image Optimization Audit
Total Images
72
Total Size
1131 KB
Oversized
8
Wasted
184 KB
13 missing dimensions 17 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.