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https://web.skype.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
82
GRADE
B
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
3.61g CO2 per view
FIX
3.61g CO2 per view
Critical::
3.61g CO2 per page view
This page transfers 12.8 MB, producing an estimated 3.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.67g, network 0.62g, end-user device 2.32g.
Got: 3.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 433.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 433.5 kg of CO2 annually — equivalent to charging 54183 smartphones.

3.61g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 12.8 MB

Your site
3.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.67g
Network
0.62g
End-user device
2.32g
At 10,000 monthly views: Monthly: 36.1 kg · Annual: 433.5 kg · ≈ 54183 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::
3.61g 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

3.61g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 502% more
vs Target 622% 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 144 KB (vs 13061 KB first visit). 121 of 125 resources are served from browser cache, saving 3.57g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 3.61g)
First visit
13061 KB
Repeat visit
144 KB

99% reduction on repeat visits

Saving 3.57g CO2 per returning visitor

121 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 23 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 23 KB (0% of page weight)

Unused JS 23 KB

0.01g unnecessary CO2 per visit

Actual transfer 13061 KB
Theoretical minimum 13037 KB
Potential savings 23 KB (0.01g 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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