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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
2.08g CO2 per view
FIX
2.08g CO2 per view
Critical::
2.08g CO2 per page view
This page transfers 8.8 MB, producing an estimated 2.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.60g.
Got: 2.08g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 249.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 249.4 kg of CO2 annually — equivalent to charging 31175 smartphones.
Info::
Green hosting reduces data center emissions

2.08g

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
2.08g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.43g
End-user device
1.60g
At 10,000 monthly views: Monthly: 20.8 kg · Annual: 249.4 kg · ≈ 31175 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.08g 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

2.08g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 246% more
vs Target 316% more
B
Transfer Efficiency
79% efficient
REVIEW
79% efficient
Info::
Transfer efficiency: 79%
An estimated 1929 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1929 KB of unused JavaScript. This wasted data produces 0.45g of unnecessary CO2 per page view.
79% efficient

Total waste: 1929 KB (21% of page weight)

Unused JS 1929 KB

0.45g unnecessary CO2 per visit

Actual transfer 8991 KB
Theoretical minimum 7061 KB
Potential savings 1929 KB (0.45g 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 455 KB (vs 8991 KB first visit). 614 of 648 resources are served from browser cache, saving 1.97g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 2.08g)
First visit
8991 KB
Repeat visit
455 KB

95% reduction on repeat visits

Saving 1.97g CO2 per returning visitor

614 resources served from cache · 34 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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