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https://ustream.tv

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
59
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
2.10g CO2 per view
FIX
2.10g CO2 per view
Critical::
2.10g CO2 per page view
This page transfers 7.4 MB, producing an estimated 2.10g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.39g, network 0.36g, end-user device 1.35g.
Got: 2.10g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 251.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 251.5 kg of CO2 annually — equivalent to charging 31434 smartphones.

2.10g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site
2.10g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.39g
Network
0.36g
End-user device
1.35g
At 10,000 monthly views: Monthly: 21.0 kg · Annual: 251.5 kg · ≈ 31434 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.10g 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

2.10g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 249% more
vs Target 319% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 4 KB (vs 7577 KB first visit). 44 of 46 resources are served from browser cache, saving 2.09g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.10g)
First visit
7577 KB
Repeat visit
4 KB

100% reduction on repeat visits

Saving 2.09g CO2 per returning visitor

44 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 456 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 456 KB (6% of page weight)

Unused JS 456 KB

0.13g unnecessary CO2 per visit

Actual transfer 7577 KB
Theoretical minimum 7120 KB
Potential savings 456 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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