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Sustainability
· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
69
GRADE
D
FIX
2
REVIEW
3
PASS
2
INFO
0
Checks
72 PASS 3 REVIEW 2 FIX
FCO2 Per Page LoadAction1.63g CO2 per viewFIX
CO2 Per Page Load
Action1.63g CO2 per view
1.63g CO2 per view
Warning::
1.63g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.63g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.25g.
Got: 1.63g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 195.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 195.2 kg of CO2 annually — equivalent to charging 24405 smartphones.
Info::
Green hosting reduces data center emissions
1.63g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 21% of websites
Sustainable Web Design model v4 · Page size: 6.9 MB
Your site
1.63g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.34g
End-user device
1.25g
At 10,000 monthly views: Monthly: 16.3 kg · Annual: 195.2 kg · ≈ 24405 smartphone charges
FCarbon BudgetAction79th percentileFIX
Carbon Budget
Action79th percentile
79th percentile
Warning::
1.63g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.63g
79th percentile
Cleaner than 21% of websites
✗ Above the median website
vs Median 171% more
vs Target 225% more
BTransfer Efficiency81% efficientREVIEW
Transfer Efficiency
81% efficient
81% efficient
Info::
Transfer efficiency: 81%
An estimated 1312 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1312 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
Total waste: 1312 KB (19% of page weight)
Unused JS 1312 KB
0.30g unnecessary CO2 per visit
Actual transfer 7039 KB
Theoretical minimum 5726 KB
Potential savings 1312 KB (0.30g 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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓
Fastly: 100% renewable energy for edge network
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 302 KB (vs 7039 KB first visit). 155 of 159 resources are served from browser cache, saving 1.56g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.63g)
First visit
7039 KB
Repeat visit
302 KB
96% reduction on repeat visits
Saving 1.56g CO2 per returning visitor
155 resources served from cache · 4 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.