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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
62
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.37g CO2 per view
FIX
2.37g CO2 per view
Critical::
2.37g CO2 per page view
This page transfers 10.0 MB, producing an estimated 2.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.49g, end-user device 1.82g.
Got: 2.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 284.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 284.1 kg of CO2 annually — equivalent to charging 35512 smartphones.
Info::
Green hosting reduces data center emissions

2.37g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.0 MB

Your site
2.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.49g
End-user device
1.82g
At 10,000 monthly views: Monthly: 23.7 kg · Annual: 284.1 kg · ≈ 35512 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.37g 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

2.37g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 295% more
vs Target 373% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 1871 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1871 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
82% efficient

Total waste: 1871 KB (18% of page weight)

Unused JS 1871 KB

0.43g unnecessary CO2 per visit

Actual transfer 10242 KB
Theoretical minimum 8371 KB
Potential savings 1871 KB (0.43g 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
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 Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 484 KB (vs 10242 KB first visit). 477 of 524 resources are served from browser cache, saving 2.26g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 2.37g)
First visit
10242 KB
Repeat visit
484 KB

95% reduction on repeat visits

Saving 2.26g CO2 per returning visitor

477 resources served from cache · 47 resources re-downloaded

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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