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https://mountsinai.org

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
57
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.48g CO2 per view
FIX
2.48g CO2 per view
Critical::
2.48g CO2 per page view
This page transfers 8.8 MB, producing an estimated 2.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.46g, network 0.43g, end-user device 1.59g.
Got: 2.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 297.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 297.6 kg of CO2 annually — equivalent to charging 37194 smartphones.

2.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.8 MB

Your site
2.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.46g
Network
0.43g
End-user device
1.59g
At 10,000 monthly views: Monthly: 24.8 kg · Annual: 297.6 kg · ≈ 37194 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::
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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.48g 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

2.48g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 313% more
vs Target 396% more
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 90 KB (vs 8965 KB first visit). 172 of 176 resources are served from browser cache, saving 2.45g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.48g)
First visit
8965 KB
Repeat visit
90 KB

99% reduction on repeat visits

Saving 2.45g CO2 per returning visitor

172 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 484 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 484 KB (5% of page weight)

Unused JS 484 KB

0.13g unnecessary CO2 per visit

Actual transfer 8965 KB
Theoretical minimum 8481 KB
Potential savings 484 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

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

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