https://nfpa.org
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
3
REVIEW
0
PASS
3
INFO
0
Checks
63 PASS 3 FIX
DCO2 Per Page LoadAction1.02g CO2 per viewFIX
CO2 Per Page Load
Action1.02g CO2 per view
1.02g CO2 per view
Warning::
1.02g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.79g.
Got: 1.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 122.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 122.7 kg of CO2 annually — equivalent to charging 15338 smartphones.
Info::
Green hosting reduces data center emissions
1.02g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 38% of websites
Sustainable Web Design model v4 · Page size: 4.3 MB
Your site
1.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 10.2 kg · Annual: 122.7 kg · ≈ 15338 smartphone charges
DCarbon BudgetAction62th percentileFIX
Carbon Budget
Action62th percentile
62th percentile
Warning::
1.02g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.02g
62nd percentile
Cleaner than 38% of websites
✗ Above the median website
vs Median 70% more
vs Target 105% more
DTransfer EfficiencyAction58% efficientFIX
Transfer Efficiency
Action58% efficient
58% efficient
Warning::
Transfer efficiency: 58%
An estimated 1865 KB (42%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1865 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
Total waste: 1865 KB (42% of page weight)
Unused JS 1865 KB
0.43g unnecessary CO2 per visit
Actual transfer 4423 KB
Theoretical minimum 2558 KB
Potential savings 1865 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: 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 Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 385 KB (vs 4423 KB first visit). 125 of 130 resources are served from browser cache, saving 0.93g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.02g)
First visit
4423 KB
Repeat visit
385 KB
91% reduction on repeat visits
Saving 0.93g CO2 per returning visitor
125 resources served from cache · 5 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.