Skip to content
https://nbcbayarea.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
50
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
3.69g CO2 per view
FIX
3.69g CO2 per view
Critical::
3.69g CO2 per page view
This page transfers 13.0 MB, producing an estimated 3.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.68g, network 0.64g, end-user device 2.37g.
Got: 3.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 442.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 442.8 kg of CO2 annually — equivalent to charging 55344 smartphones.

3.69g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 13.0 MB

Your site
3.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.68g
Network
0.64g
End-user device
2.37g
At 10,000 monthly views: Monthly: 36.9 kg · Annual: 442.8 kg · ≈ 55344 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Akamai: Committed to 50% renewable by 2030
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 HostingNot Green Hosted
Hosting Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.69g 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

3.69g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 515% more
vs Target 638% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 1518 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1518 KB of unused JavaScript. This wasted data produces 0.42g of unnecessary CO2 per page view.
89% efficient

Total waste: 1518 KB (11% of page weight)

Unused JS 1518 KB

0.42g unnecessary CO2 per visit

Actual transfer 13341 KB
Theoretical minimum 11822 KB
Potential savings 1518 KB (0.42g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 134 KB (vs 13341 KB first visit). 385 of 402 resources are served from browser cache, saving 3.65g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 3.69g)
First visit
13341 KB
Repeat visit
134 KB

99% reduction on repeat visits

Saving 3.65g CO2 per returning visitor

385 resources served from cache · 17 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback