https://thecrimson.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction0.82g CO2 per viewFIX
CO2 Per Page Load
Action0.82g CO2 per view
0.82g CO2 per view
Info::
0.82g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.63g.
Got: 0.82g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 98.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 98.3 kg of CO2 annually — equivalent to charging 12286 smartphones.
Info::
Green hosting reduces data center emissions
0.82g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 44% of websites
Sustainable Web Design model v4 · Page size: 3.5 MB
Your site
0.82g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 8.2 kg · Annual: 98.3 kg · ≈ 12286 smartphone charges
DCarbon BudgetAction56th percentileFIX
Carbon Budget
Action56th percentile
56th percentile
Warning::
0.82g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.82g
56th percentile
Cleaner than 44% of websites
✗ Above the median website
vs Median 37% more
vs Target 64% more
BTransfer Efficiency84% efficientREVIEW
Transfer Efficiency
84% efficient
84% efficient
Info::
Transfer efficiency: 84%
An estimated 562 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 562 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 562 KB (16% of page weight)
Unused JS 562 KB
0.13g unnecessary CO2 per visit
Actual transfer 3543 KB
Theoretical minimum 2980 KB
Potential savings 562 KB (0.13g 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: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 56 KB (vs 3543 KB first visit). 152 of 159 resources are served from browser cache, saving 0.81g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.82g)
First visit
3543 KB
Repeat visit
56 KB
98% reduction on repeat visits
Saving 0.81g CO2 per returning visitor
152 resources served from cache · 7 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.