https://www.calendly.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DCarbon BudgetAction55th percentileFIX
Carbon Budget
Action55th percentile
55th percentile
Warning::
0.80g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.80g
55th percentile
Cleaner than 45% of websites
✗ Above the median website
vs Median 33% more
vs Target 60% more
BCO2 Per Page Load0.80g CO2 per viewREVIEW
CO2 Per Page Load
0.80g CO2 per view
0.80g CO2 per view
Info::
0.80g CO2 per page view
This page transfers 3.4 MB, producing an estimated 0.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.61g.
Got: 0.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 95.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 95.9 kg of CO2 annually — equivalent to charging 11985 smartphones.
Info::
Green hosting reduces data center emissions
0.80g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 45% of websites
Sustainable Web Design model v4 · Page size: 3.4 MB
Your site
0.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.17g
End-user device
0.61g
At 10,000 monthly views: Monthly: 8.0 kg · Annual: 95.9 kg · ≈ 11985 smartphone charges
CTransfer EfficiencyAction62% efficientREVIEW
Transfer Efficiency
Action62% efficient
62% efficient
Warning::
Transfer efficiency: 62%
An estimated 1305 KB (38%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1305 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
Total waste: 1305 KB (38% of page weight)
Unused JS 1305 KB
0.30g unnecessary CO2 per visit
Actual transfer 3456 KB
Theoretical minimum 2151 KB
Potential savings 1305 KB (0.30g 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: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 83 KB (vs 3456 KB first visit). 131 of 132 resources are served from browser cache, saving 0.78g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.80g)
First visit
3456 KB
Repeat visit
83 KB
98% reduction on repeat visits
Saving 0.78g CO2 per returning visitor
131 resources served from cache · 1 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.