https://www.clay.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction3.81g CO2 per viewFIX
CO2 Per Page Load
Action3.81g CO2 per view
3.81g CO2 per view
Critical::
3.81g CO2 per page view
This page transfers 16.1 MB, producing an estimated 3.81g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.79g, end-user device 2.92g.
Got: 3.81g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 456.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 456.9 kg of CO2 annually — equivalent to charging 57107 smartphones.
Info::
Green hosting reduces data center emissions
3.81g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 16.1 MB
Your site
3.81g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.10g
Network
0.79g
End-user device
2.92g
At 10,000 monthly views: Monthly: 38.1 kg · Annual: 456.9 kg · ≈ 57107 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.81g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
3.81g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 535% more
vs Target 661% more
BWeb Font Weight Variants5 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
5 font weights loaded across 1 famil(y/ies)
5 font weights loaded across 1 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Space Mono.
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::
AWS: Renewable energy varies by region; committed to 100% by 2025
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 AWS✗CDN Cloudflare✓
AWS: Renewable energy varies by region; committed to 100% by 2025
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 75 KB (vs 16471 KB first visit). 171 of 173 resources are served from browser cache, saving 3.79g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.81g)
First visit
16471 KB
Repeat visit
75 KB
100% reduction on repeat visits
Saving 3.79g CO2 per returning visitor
171 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 1538 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 1538 KB (9% of page weight)
Unused JS 1538 KB
0.36g unnecessary CO2 per visit
Actual transfer 16471 KB
Theoretical minimum 14932 KB
Potential savings 1538 KB (0.36g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization200 images, 0 KB total, 0 KB wastedINFO
Image Optimization
200 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
200
Total Size
0 KB
Oversized
20
32 missing alt text 200 missing dimensions 64 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.