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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
48.51g CO2 per view
FIX
48.51g CO2 per view
Critical::
48.51g CO2 per page view
This page transfers 204.9 MB, producing an estimated 48.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.22g, network 10.03g, end-user device 37.26g.
Got: 48.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 5821.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 5821.0 kg of CO2 annually — equivalent to charging 727625 smartphones.
Info::
Green hosting reduces data center emissions

48.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 204.9 MB

Your site
48.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.22g
Network
10.03g
End-user device
37.26g
At 10,000 monthly views: Monthly: 485.1 kg · Annual: 5821.0 kg · ≈ 727625 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
48.51g 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

48.51g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 7985% more
vs Target 9602% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Amazon Web Services✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 61 KB (vs 209865 KB first visit). 78 of 79 resources are served from browser cache, saving 48.49g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 48.51g)
First visit
209865 KB
Repeat visit
61 KB

100% reduction on repeat visits

Saving 48.49g CO2 per returning visitor

78 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 755 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 755 KB (0% of page weight)

Unused JS 755 KB

0.17g unnecessary CO2 per visit

Actual transfer 209865 KB
Theoretical minimum 209110 KB
Potential savings 755 KB (0.17g 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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