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Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction1.46g CO2 per viewFIX
CO2 Per Page Load
Action1.46g CO2 per view
1.46g CO2 per view
Warning::
1.46g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.12g.
Got: 1.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 175.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 175.4 kg of CO2 annually — equivalent to charging 21928 smartphones.
Info::
Green hosting reduces data center emissions
1.46g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 26% of websites
Sustainable Web Design model v4 · Page size: 6.2 MB
Your site
1.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.30g
End-user device
1.12g
At 10,000 monthly views: Monthly: 14.6 kg · Annual: 175.4 kg · ≈ 21928 smartphone charges
FCarbon BudgetAction74th percentileFIX
Carbon Budget
Action74th percentile
74th percentile
Warning::
1.46g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.46g
74th percentile
Cleaner than 26% of websites
✗ Above the median website
vs Median 144% more
vs Target 192% more
CTransfer EfficiencyAction70% efficientREVIEW
Transfer Efficiency
Action70% efficient
70% efficient
Warning::
Transfer efficiency: 70%
An estimated 1881 KB (30%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1881 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
Total waste: 1881 KB (30% of page weight)
Unused JS 1881 KB
0.43g unnecessary CO2 per visit
Actual transfer 6324 KB
Theoretical minimum 4442 KB
Potential savings 1881 KB (0.43g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Cloudflare
Info::
Google Cloud: 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 Google Cloud✓CDN Cloudflare✓
Google Cloud: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 150 KB (vs 6324 KB first visit). 177 of 180 resources are served from browser cache, saving 1.43g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.46g)
First visit
6324 KB
Repeat visit
150 KB
98% reduction on repeat visits
Saving 1.43g CO2 per returning visitor
177 resources served from cache · 3 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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.